Market insights

The TG27 (1¼% Treasury Gilt 2027, maturing 22 July 2027) is trading at a spread of -14.93 bps to its interpolated curve yield as of 30 October 2026. This is unusually low relative to its own history over the trailing 12-month lookback. The 12-month average is roughly +5.3 bps, with a standard deviation of about 5.9 bps, so the current reading sits roughly 3.4 standard deviations below that mean and falls below the lower anomaly threshold of -12.37 bps.

Over the past day, the spread moved slightly higher, from -15.82 bps to -14.93 bps. Over the past month, it has fallen by about 16 bps, from +0.99 bps on 30 September. Over the past year, the decline is about 17 bps, from +2.00 bps on 30 October 2025. The spread reached a high of around +16.9 bps in March and April 2026 before falling steadily through the second half of the year.

A negative spread means TG27 yields less than the interpolated yield of its neighbouring gilts. In price terms, the bond is trading richer, or more expensive, than the curve implies for its maturity. Because this is a short-dated gilt, the move is notable in its own right, and it has also shifted the bond's relative valuation sharply within the past year.

For fixed-income investors, the main implication is that TG27 is an outlier on the front end of the curve. Its relative value versus adjacent maturities has changed materially, which may matter for relative-value comparisons, benchmarking, or hedging decisions that rely on curve-fitted pricing.

The bid-ask spread on the 4¼% Treasury Gilt 2046 (T46) stood at 0.5058% on 30 October 2026. This is unusually low relative to the past 6 months and sits below the statistical lower threshold of 0.5219%. Over the preceding half-year, the spread generally traded in a 0.58% to 0.62% range.

The move was abrupt rather than gradual. The spread fell from 0.6089% on 21 October to 0.498% on 22 October, a drop of roughly 11 basis points in a single session. It has since remained in a tight band of about 0.50% to 0.51%. Over the past day, the spread was essentially unchanged, edging down from 0.5069% to 0.5058%. Over the past month, it has narrowed by a similar magnitude, from about 0.618% at the end of September.

A narrower bid-ask spread indicates lower implicit transaction costs for investors and a tighter pricing gap between buyers and sellers. This generally points to improved liquidity in the bond. The dataset does not identify the cause of the shift, so the underlying driver cannot be determined from the available information. Continued monitoring would show whether the lower spread level persists.

The 4¼% Treasury Gilt 2040 (T40, maturing 7 December 2040) shows a bid-ask spread of 0.307% as of 30 October 2026. This is unusually low relative to its own history over the past six months, and it falls below the lower anomaly threshold of 0.340%, about four standard deviations under the six-month average of roughly 0.44%.

The spread was fairly stable through most of the lookback window, typically between 0.44% and 0.46%. The shift occurred abruptly on 22 October 2026, when it dropped from 0.460% to 0.298% in a single session, a decline of roughly 35%. Since then, the spread has remained in a narrow range of about 0.30% to 0.31%, indicating that the lower level has persisted for the past week rather than reflecting a one-day fluctuation.

Bid-ask spread is a key measure of trading cost and liquidity. A lower spread means that buyers and sellers are quoted more closely together, which reduces the cost of transacting in this bond. The data is consistent with improved liquidity or tighter quoting in T40 relative to its recent behaviour. The dataset does not identify the cause of the change, so the underlying driver cannot be confirmed from these figures alone.

The 4¾% Treasury Stock 2038 (TR38) shows an unusually low bid-ask spread. Its spread closed at 0.2761% on 30 October 2026, which is below the lower anomaly threshold of 0.3062% derived from the six-month lookback. Over the preceding six months, the spread typically traded in a range of roughly 0.41% to 0.43%.

The shift was abrupt rather than gradual. On 22 October 2026, the spread fell from 0.4285% to 0.2674%, a drop of about 37% in a single session. Since then it has stayed in a narrow band between 0.266% and 0.277%. Over the past day, the spread rose slightly by about 0.01 percentage points, but it remains far below its level over the past month, when it stood at 0.4308%.

A narrower bid-ask spread indicates lower transaction costs for investors and a more liquid, competitively priced market for this bond. The fact that the change occurred in one step and has persisted for several sessions suggests a discrete change in market conditions or in how quotes are being set, rather than normal day-to-day noise. The data does not identify the underlying cause, so the reason for the shift cannot be confirmed from this information alone. Because the bond's maturity (7 December 2038) has not changed, the move is specific to trading conditions for this security rather than to its yield profile.

The bid-ask spread on the 4¼% Treasury Stock 2036 (ticker T4Q, maturity 7 March 2036) has fallen to an unusually low level relative to its own history. The latest reading on 30 October 2026 is 0.2264%, below the anomaly lower threshold of 0.2772% for the past six months, and the series is flagged as a low-direction anomaly.

The shift was abrupt. Through 21 October 2026 the spread traded in a tight range of roughly 0.43% to 0.44%, consistent with the preceding six months. On 22 October it dropped to 0.2167%, a decline of about 50%, and it has since held in a narrow band of 0.2264% to 0.2275%. The persistence of the lower level over the following six trading days, rather than a single-day reading, indicates a sustained change in the bond's quoted trading costs instead of a transient spike.

A narrower bid-ask spread means that the cost of executing a round-trip trade in this bond has fallen, which generally signals improved liquidity and tighter two-way pricing from market makers. For investors, this implies lower implicit transaction costs when buying or selling T4Q. The data alone does not identify the cause of the change, and no conclusion should be drawn about the bond's yield or price direction from the spread movement alone.

The bid-ask spread of the 4⅜% Treasury Gilt 2028 (TE28, maturing 7 March 2028) has fallen to an unusually low level. As of 30 October 2026 it stood at 0.0402%, well below its 6-month range of roughly 0.20% to 0.20%, and below the statistical lower threshold of 0.080%. The series was broadly stable near 0.20% through most of the six-month lookback, with only small fluctuations.

The decline was abrupt. On 22 October 2026 the spread fell from 0.2010% to 0.0301%, and it has since settled at around 0.040%. Over the past month, the spread has narrowed by about 0.16 percentage points, a reduction of roughly 80%. Over the past day, the spread was unchanged at 0.0402%.

A narrower bid-ask spread means the gap between the prices at which dealers will buy and sell the bond is much tighter, which implies lower implicit transaction costs for investors trading this gilt. Because the change was sudden and sustained rather than gradual, it points to a discrete shift in how the bond is being quoted or traded, not a slow move in market conditions. The data alone cannot establish the underlying cause, so the observation should be monitored over subsequent sessions to confirm whether the new level persists.

The bid-ask spread on the 1¾% Treasury Gilt 2037 (TG37, ISIN GB00BZB26Y51, maturing 7 September 2037) shows an abrupt break in its trend. Over the preceding six months, the spread moved within a fairly narrow band of roughly 0.54% to 0.58%, closing at 0.5715% on 21 October 2026.

On 22 October 2026 it fell to 0.2852%, roughly halving in a single session. It has stayed near that level since, reaching 0.2829% on 30 October 2026. The current reading sits well below the lower anomaly threshold of 0.3556%, and the data shows no gradual decline leading up to the change. Over the same six-month lookback, the spread was never observed below this threshold.

The move is a step change rather than a drift, which points to a discrete shift in the bond's trading conditions rather than a slow change in market depth. A narrower bid-ask spread indicates lower implicit transaction costs for investors trading TG37 and suggests tighter quoted pricing between buyers and sellers. The dataset does not identify the cause of the shift, so the underlying driver cannot be confirmed from these figures alone. Market participants monitoring this bond may wish to verify whether the change reflects a sustained improvement in liquidity or a temporary condition.

The bid-ask spread on the TR35 (1 1/8% Index-linked Treasury Gilt 2035, ISIN GB00BT7HZZ68) fell to 0.339% on 2026-10-30, which is unusually low relative to the past six months. Over that lookback window, the spread averaged roughly 0.99% with a standard deviation of about 0.16 percentage points. The current reading sits below the lower anomaly threshold of 0.514%, roughly three standard deviations under the average.

The change was abrupt rather than gradual. The spread was 1.0336% on 2026-10-21 and dropped to 0.3404% on 2026-10-22, a single-session decline of about two-thirds. It has since stayed between 0.33% and 0.34%, and no comparable level appears in the preceding six months of data.

A narrower bid-ask spread implies lower implicit trading costs for holders and buyers of this inflation-linked gilt and suggests tighter quoted liquidity. Because the shift occurred on one date and has persisted, it points to a possible structural change in how the bond is quoted or traded rather than a temporary market move. The data alone does not identify the cause, so the observation should be verified against market-structure or data-source changes before it informs pricing or execution decisions.

The 4% Treasury Gilt 2031 (T31, ISIN GB00BPSNBF73, maturing 22 October 2031) shows a bid-ask spread of 0.1356%, which is unusually low relative to the past six months. The spread has sat in a fairly narrow band of roughly 0.30% to 0.31% since late April 2026, with a low of 0.3048% on 17 June and a high of 0.3143% on 28 September. The current reading falls below the anomaly threshold of 0.1801%, which is about three standard deviations below the six-month average.

The break occurred abruptly on 22 October 2026, when the spread fell from 0.3138% to 0.1360% in a single session. It has remained near that level since, with one brief dip to 0.1254% on 27 October. Over the past day, the spread was essentially flat, moving from 0.1359% to 0.1356%. Over the past month, it declined by roughly 57%, from 0.3138% to 0.1356%.

The implication is that trading costs for T31 have fallen materially. A tighter spread means a narrower gap between the prices at which dealers will buy and sell the bond, which generally indicates improved liquidity and lower transaction costs for investors. The data does not identify the cause of the step change, and the sudden, discrete nature of the move suggests it may reflect a change in market-making conditions or quoting practices rather than a gradual shift in demand. Investors should confirm the persistence of this level before relying on it.

The bid-ask spread of the 0 1/8% Index-linked Treasury Gilt 2056 (TR56) has fallen to 1.16% as of 30 October 2026. This is well below its six-month range, which has typically sat around 2.0% to 2.8%, and below the anomaly threshold of 1.37%. The data shows a sharp break rather than a gradual decline. The spread was 2.30% on 21 October and dropped to 1.15% on 22 October, and it has remained between roughly 1.14% and 1.17% since then.

Over the past day, the spread was essentially unchanged, moving by less than 0.01 percentage points. Over the past month, it narrowed by about 1.3 percentage points, from 2.42% at the end of September to the current level. The abruptness of the move and the stability that followed suggest a structural change in how the bond is quoted or traded, rather than normal market noise.

A narrower bid-ask spread generally indicates lower transaction costs and tighter pricing for market participants. For investors trading this index-linked gilt, this would mean cheaper entry and exit, provided the change persists. The data does not identify the underlying cause, so the reason for the shift cannot be determined from this information alone. The persistence of the lower spread over the coming period will be the key factor in assessing whether it represents a lasting improvement in the bond's liquidity.

The bid-ask spread on the TR31 (0 1/8% Index-linked Treasury Gilt 2031, maturing 10 August 2031) has been unusually low relative to its own history. Over the past six months, the spread stayed in a narrow band of roughly 1.02% to 1.05%, with a mean that sat well inside the expected range. On 22 October 2026, it fell abruptly from 1.0504% to 0.1469% and has since remained between about 0.136% and 0.147%. The current reading of 0.1362% is below the lower statistical threshold of 0.378%, which flags it as a low-side anomaly.

The implication is that the cost of trading TR31 between a buyer's bid and a seller's offer has fallen by roughly 86% in a single step change, rather than drifting over time. A narrower spread generally indicates lower implicit transaction costs and more competitive two-way quotes for this inflation-linked gilt. The data alone does not identify the cause of the shift, such as a change in market-maker quoting behaviour, a shift in trading activity, or a change in how the spread is captured, so the move should be confirmed against underlying quote and trade records before it is interpreted as a durable change in market liquidity.

The bid-ask spread on the TR37 index-linked gilt (1 1/8% Index-linked Treasury Gilt 2037) has fallen to 0.42% as of 30 October 2026. Over the past 6 months, the spread typically ranged around 1.6%, with an implied mean of approximately 1.57% and a lower anomaly threshold of 0.73%. The current reading sits well below that threshold, roughly three standard deviations under the average.

The shift was abrupt rather than gradual. The spread stood at 1.66% on 21 October 2026 and dropped to 0.41% on 22 October 2026. It has remained in a narrow band of roughly 0.41% to 0.42% since then, indicating that the lower level has persisted across the last six trading sessions rather than reflecting a single outlier day.

For investors, a narrower bid-ask spread means a lower implicit cost of entering or exiting a position in this bond, which is generally associated with improved liquidity and more efficient pricing. The data alone does not identify the cause of the change, so it is not possible to determine from this series whether it reflects altered market-making conditions, a change in quoting practices, or another factor. Monitoring whether the spread holds at these levels would help clarify whether the change is sustained.

The bid-ask spread on the 4½% Treasury Gilt 2034 (ticker TR34, ISIN GB00B52WS153, maturity 7 September 2034) has fallen to 0.1873% as of 30 October 2026. This is unusually low relative to its own history: over the past six months, the spread generally traded between about 0.40% and 0.42%, and the anomaly threshold for low readings sits at roughly 0.25%, well above the current level.

The decline was abrupt rather than gradual. On 21 October 2026 the spread stood at 0.4185%, and on 22 October it dropped to 0.1987%, a fall of roughly 0.22 percentage points in a single session, after which it remained in a narrow band near 0.198% before reaching 0.1873% on 30 October. The step change and the subsequent stability suggest a discrete shift in quoting conditions rather than a gradual change in market activity, although the data alone does not identify the cause.

From a trading perspective, a narrower bid-ask spread means that the cost of immediately buying and selling TR34 has fallen by more than half relative to its recent norm. This implies better apparent liquidity for this gilt, which could lower transaction costs for investors executing trades in this bond. Because the spread is a measure of dealer pricing rather than the yield or price level, this change does not by itself indicate a move in the bond's valuation or yield.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2039 (TG39), an inflation-linked gilt maturing on 2039-03-22, has been flagged as unusually low relative to the past six months. The spread stood at 0.488% on 2026-10-30, below the lower anomaly threshold of 0.859%.

Until 2026-10-21, the spread had moved within a relatively narrow band of about 1.87% to 1.97%. On 2026-10-22 it fell sharply to 0.4781%, and it has remained near that level since. Over the past month, the spread has declined from 1.958% on 2026-09-30 to 0.488%, a fall of roughly 75%. Over the past day, it was essentially unchanged, moving from 0.4892% to 0.488%.

The shift is a clear break from the bond's recent trading pattern rather than a gradual trend, and it has persisted for several sessions. For market participants, a spread of roughly a quarter of its previous level implies materially lower implicit transaction costs when buying or selling TG39. The data does not identify the cause of the change, so it should be treated as an observed structural shift in the bond's quoted liquidity that warrants monitoring.

The bid-ask spread on the 4 5/8% Green Gilt 2037 (T37H) fell to 0.2435% on 30 October 2026, well below its recent range and under the anomaly lower threshold of 0.2864%. Over the past 6 months, the spread mostly traded between roughly 0.40% and 0.43%, so the current level is about 40% tighter than that typical range.

The shift is persistent rather than a single-day outlier. Spreads were in the 0.41% to 0.43% range until 21 October 2026. On 22 October, the spread dropped to 0.2343% and has since stayed between about 0.23% and 0.25% for seven consecutive sessions. Earlier one-day dips, such as 0.3982% on 28 August and 0.4069% on 29 September, quickly reverted, which makes this sustained move distinct.

A narrower bid-ask spread means the cost of buying and selling the bond relative to its quoted mid-price has decreased, which generally indicates improved liquidity or more competitive quoting for this line. The data alone does not identify the cause of the change, and it does not show whether the lower spread will persist. Investors trading T37H may face lower execution costs at present than in the preceding six months.

The bid-ask spread on the 1 7/8% Index-linked Treasury Gilt 2049 (TR49) is unusually low compared with its own recent history. Over the past six months, the spread generally ranged between about 0.95% and 1.10%, averaging roughly 1.00%. The latest reading of 0.73% sits below the statistical lower threshold of approximately 0.77%, which flags the observation as an anomaly.

The move is abrupt and persistent rather than a one-day outlier. On 22 October 2026, the spread fell from 0.99% to 0.73%, and it has stayed in a narrow band of about 0.72% to 0.73% in every session since. The drop represents a reduction of roughly 27% against the six-month average.

A spread this tight implies that the cost of trading this long-dated, inflation-linked gilt has fallen relative to its norm. Narrower spreads typically indicate improved liquidity and more competitive quoting among market makers, which can benefit investors rebalancing real-yield exposure. The data alone does not identify the underlying cause, so the persistence of this level should be monitored before drawing firm conclusions about the bond's trading conditions.

The bid-ask spread of the 4¾% Treasury Gilt 2030 (TR30, ISIN GB00B24FF097, maturing 7 December 2030) has fallen to an unusually low level. Throughout the six-month lookback period, from late April to 21 October 2026, the spread traded in a tight range of roughly 0.29% to 0.30%. On 22 October 2026 it dropped abruptly to 0.1106%, a decline of about 0.19 percentage points in a single session. It has remained near that level through 30 October 2026, when it stood at 0.1104%.

The statistical model flags this reading as a low-side anomaly. The current spread sits well below the lower threshold of approximately 0.159%, which corresponds to a deviation of several standard deviations from the recent average. The shift is a discrete step change rather than a gradual trend, which suggests a specific event or a change in how quotes are produced, rather than a gradual shift in market conditions.

The implication is that the bond can currently be traded at a substantially lower implicit transaction cost than in the preceding months, which would generally indicate improved liquidity or tighter quoting by market makers. The data alone does not identify the cause, so it is unclear whether the change reflects durable market conditions or a temporary or methodological effect. Investors monitoring this bond should verify the new level against actual executable quotes and trade volumes before drawing conclusions.

The 4⅝% Treasury Gilt 2034 (T34, ISIN GB00BPJJKN53) has shown a sharp contraction in its bid-ask spread. Over the past six months, the spread held in a fairly tight band of roughly 0.40% to 0.42%, with daily readings between about 0.397% and 0.416% until late October.

On 2026-10-22, the spread fell abruptly from 0.4137% to 0.1861%. It has remained near that level since, closing at 0.1853% on 2026-10-30. This latest reading sits below the anomaly's lower threshold of 0.242%, placing it well outside the bond's recent range. A single lower observation of 0.1754% was recorded on 2026-10-29 before the spread edged back up.

The bid-ask spread measures the cost of executing a round-trip trade. A reduction of more than half, sustained over several sessions, indicates that transacting in T34 has become considerably cheaper relative to its own recent history. Narrower spreads are generally associated with deeper quoted liquidity or lower dealer compensation for holding inventory. The data confirm the scale and persistence of the change but do not identify its cause, so the continuation of the lower level is the key point to monitor.

The 0.5% Treasury Gilt 2061 (TG61), a conventional long-dated gilt maturing on 22 October 2061, is showing a bid-ask spread of 1.065% as of 30 October 2026. This is well below its six-month range, which has mostly sat between roughly 1.6% and 2.3%. The lower threshold for an anomaly is 1.21%, so the current reading falls outside the expected band. Relative to the six-month average of about 1.95%, it sits roughly 3.6 standard deviations lower.

The move was abrupt rather than gradual. The spread stood at 2.0026% on 21 October 2026 and fell to 1.0394% on 22 October 2026, a drop of about 0.96 percentage points in a single session. Over the past month, the spread has fallen from around 1.96% to 1.07%. Since the drop, it has remained in a narrow range of about 1.07% to 1.08%, and it moved by less than 0.01 percentage points over the past day.

A narrower bid-ask spread means the cost of trading the bond, measured as the gap between buying and selling prices, has fallen sharply compared with its recent history. This indicates tighter pricing for TG61 and potentially cheaper execution for market participants. The persistence of the new level suggests it is not a one-off quote, although the data alone does not show what caused the change.

The bid-ask spread on the 1 5/8% Treasury Gilt 2054 (TR54), a conventional long-dated gilt maturing on 22 October 2054, has moved to unusually low levels. On 30 October 2026 the spread stood at 0.7387%, below the statistical lower threshold of 0.8129% for the six-month lookback window, which flags the reading as an anomaly.

Over the past six months, the spread typically traded between roughly 1.0% and 1.2%, with an average near 1.12%. The series was relatively stable until 21 October 2026, when it stood at 1.0331%. On 22 October it dropped to 0.7247%, and it has remained in a narrow band of roughly 0.72% to 0.75% since. The past month therefore shows a step change rather than a gradual decline, and the level is more than two standard deviations below the recent mean.

A narrower bid-ask spread means the difference between the prices at which dealers will buy and sell the bond has shrunk, which generally indicates lower transaction costs and more competitive quoting for this line. The data does not identify the cause of the shift, so it should be monitored to see whether the lower spread persists or reverts toward its prior range.

The 3½% Treasury Gilt 2045 (T45, ISIN GB00BN65R313, maturing 22 January 2045) shows a bid-ask spread of 0.49% as of 30 October 2026, unusually low relative to its behaviour over the past six months. The reading sits below the anomaly threshold of 0.53%, the lower bound of a band set at the six-month mean plus or minus three standard deviations (mean approximately 0.65%, standard deviation approximately 0.04%).

Over the preceding six months, the spread generally traded between roughly 0.63% and 0.68%, peaking at about 0.68% in early October 2026. On 22 October 2026, it fell abruptly from 0.67% to 0.49%, a drop of about 26% in a single session. It has since remained in a narrow band of roughly 0.49% to 0.51%. Over the past month, the spread declined by about 0.19 percentage points, or roughly 28%. Over the past day, the change was marginal, at around -0.001 percentage points.

The current level implies lower trading costs for T45 than at any point in the six-month lookback, which generally indicates tighter quoting and easier trade execution in the bond. The step-like nature of the move, rather than a gradual decline, points to a discrete change in market conditions or in how quotes are set for this bond, rather than a continuation of an existing trend. The data alone does not identify the cause, so the persistence of this lower spread should be monitored before drawing broader conclusions about liquidity in this bond.

The bid-ask spread on the 0 5/8% Treasury Gilt 2035 (ticker TG35, ISIN GB00BMGR2916, maturing 31 July 2035) has fallen sharply to unusually low levels. Over the past six months, the spread generally traded between about 0.57% and 0.60%, with a mean near 0.58%. On 22 October 2026 it dropped abruptly to 0.2508%, and it has stayed around 0.25% since, reaching 0.249% on 30 October 2026.

The current reading sits well below the statistical lower threshold of 0.337% derived from the six-month lookback, and the drop is a discrete step rather than a gradual decline. The knowledge base does not identify a cause, so the data alone cannot establish whether the change reflects a shift in market-making, a change in trading activity, or another factor.

For investors, a narrower bid-ask spread means that buying and selling TG35 now carries a lower implicit transaction cost than in the preceding months, which generally indicates improved liquidity in this bond. Because the bid-ask spread is a liquidity measure rather than a price measure, this development does not by itself indicate a change in the bond's yield or price level.

TS29, the 4⅛% Treasury Gilt 2029 maturing on 22 July 2029, shows a sharp anomaly in its bid-ask spread. On 22 October 2026 the spread fell to 0.0714% from 0.3061% the previous day. Over the preceding six months it had held in a narrow band of roughly 0.30% to 0.31%. The latest reading of 0.0713% sits well below the anomaly's lower threshold of 0.1356%.

Over the past day, the spread moved from 0.0816% to 0.0713%, a decline of about 0.01 percentage points. Over the past month, it fell from 0.3060% to 0.0713%, a reduction of roughly 77%. Since the break, readings have alternated between about 0.0714% and 0.0816%, pointing to a stable new level rather than a continuing downward trend.

A spread at this level implies much tighter gaps between dealer bid and ask quotes, which would lower the implicit transaction cost for investors trading TS29 and suggest improved apparent liquidity. However, the shift was abrupt, moving from a stable range near 0.30% to a new range in a single session. This discontinuity warrants checking against possible changes in quoting conventions or data sources before it is treated as a genuine liquidity improvement.

The bid-ask spread on the T33H (4 1/8% Treasury Gilt 2033) fell to 0.1683% on 30 October 2026, below its lower anomaly threshold of 0.2035%. Over the preceding six months, the spread stayed within a fairly narrow band of roughly 0.305% to 0.318%, so the current reading is about half its recent typical level.

The change was abrupt rather than gradual. The spread was 0.3169% on 21 October 2026, then dropped to 0.169% on 22 October and has remained near that level since, with readings of 0.1582% on 26 and 29 October. Since the bond's maturity date is 7 March 2033 and its coupon is 4.125%, this is a conventional gilt with several years remaining, so the sharp narrowing is not explained by its approach to maturity.

For investors, a narrower bid-ask spread means a lower implicit cost of trading the bond, as the gap between the price at which dealers will buy and sell is smaller. The dataset does not identify the cause of the change, and it should be monitored to confirm whether the lower spread persists.

The bid-ask spread on the T27 (1¼% Index-linked Treasury Gilt 2027, maturing 22 November 2027) has moved sharply lower. Through 21 October 2026 the spread traded in a narrow band of roughly 0.97% to 0.99%, consistent with the preceding six months. On 22 October 2026 it fell to 0.0393%, and from 23 October it has remained near 0.03%. The current reading of 0.0295% sits far below the anomaly threshold of 0.28%, which is the lower bound implied by the six-month lookback.

Over the past day, the spread was unchanged at 0.0295%, indicating that the new level has been stable rather than volatile. Over the past month, the spread has declined by roughly 0.95 percentage points from about 0.98% at the end of September, a reduction of around 97%.

The implication is that the bond now appears to be quoted at a much tighter spread than its own history and the wider set of short-dated index-linked gilts would suggest. A spread this narrow means that the cost of immediately buying and selling the bond has fallen substantially, which generally points to deeper or more competitive market-making in this line. The data does not show the cause, and a change in how quotes are captured or reported could also produce a step change of this kind. Confirming which explanation applies would require checking the underlying quote and trade data before drawing conclusions about the bond's liquidity.

The bid-ask spread on the 1 5/8% Treasury Gilt 2071 (TG71) fell to 0.8558% on 30 October 2026, the lowest reading in the past six months. The spread has been unusually tight since 22 October, when it dropped abruptly from 1.3631% to 0.8679% in a single session. Over the following six trading days it has stayed in a narrow range of roughly 0.86% to 0.87%, so this is a sustained shift rather than a one-day anomaly.

The current reading sits well below the anomaly threshold of 0.97%, which is about three standard deviations below the six-month norm. Over the preceding six months, the spread mostly ranged between about 1.3% and 1.44%. The only comparable dip was a single-day print of 1.0672% on 17 September 2026, which reverted to 1.3488% the next day. The current move is different because it has persisted.

A materially narrower bid-ask spread indicates lower implicit trading costs and tighter quoting for this long-dated gilt, which would benefit investors executing trades in it. The data alone does not reveal the cause of the change, such as a shift in market-maker quoting or liquidity conditions, so further information would be needed to attribute it. Since the spread has remained at this level for several sessions, it is worth monitoring whether the tighter pricing holds.

The bid-ask spread on the TR50 gilt, the 0 1/2% Index-linked Treasury Gilt 2050, is at 0.85% as of 30 October 2026. This is well below its six-month range and under the lower anomaly threshold of about 1.17%. The six-month average is roughly 2.16%, so the current level sits about three standard deviations below normal.

The shift was abrupt. The spread was around 2.07% on 21 October 2026, then fell to 0.86% on 22 October and has stayed between roughly 0.85% and 0.87% since. Over the past month, the spread has narrowed by about 1.4 percentage points, from roughly 2.2% at the end of September. Over the past day, the movement was negligible, at about 0.01 percentage points.

A sudden, sustained step change of this size, rather than a gradual drift, is more consistent with a change in quoting conditions, market-maker participation or data methodology than with a gradual shift in liquidity. A narrower spread means lower implicit trading costs for investors in this index-linked gilt. The data alone cannot establish the cause, so the persistence of the new level should be monitored before drawing firm conclusions.

The bid-ask spread on the TRTQ (0¾% Index-linked Treasury Gilt 2034) has been flagged as an anomaly. Over the past day, the spread fell from 1.6079% on 21 October 2026 to 0.2890% on 22 October 2026, a drop of about 1.32 percentage points, or roughly 82%.

Before this break, the spread had been relatively stable for the preceding six months, generally trading between about 1.5% and 1.6%. The latest reading of 0.2883% is well below the lower threshold of 0.63% for the six-month lookback period, which is why the observation is classified as unusually low. Over the past month, the spread has fallen from 1.6113% to 0.2883%, a similar decline of about 1.32 percentage points.

The move is a sharp step change rather than a gradual trend: the spread has held near 0.28% to 0.29% in every session since 22 October 2026. A lower bid-ask spread indicates a narrower gap between buy and sell quotes, which typically points to tighter pricing and lower trading costs for investors in this bond. The data provided does not identify the cause of the change, so the underlying driver cannot be confirmed from this knowledge base alone.

The bid-ask spread on the 1½% Green Gilt 2053 (TG53) narrowed sharply to 0.76% on 30 October 2026, well below its recent range and under the 0.80% lower threshold for the six-month lookback. Over the past six months, the spread generally moved between about 0.93% and 1.21%, with a mean near 1.10% and a standard deviation of roughly 0.10 percentage points.

The shift was abrupt. On 21 October the spread stood at 1.15%, and on 22 October it fell to 0.74%, a drop of roughly 36% in a single session. Over the past day, it edged up only slightly, to 0.76%, and has stayed between 0.73% and 0.76% since 22 October. Over the past month, the spread has fallen by roughly 30%, from about 1.09% at the end of September.

A narrower bid-ask spread generally means lower implicit transaction costs for investors trading this bond, which points to improved liquidity or tighter quoting conditions. The data does not identify the cause of the change, such as dealer activity, market structure, or trading volume, so further information would be needed to attribute it. The persistence of the lower level over several sessions suggests a sustained change rather than a one-off data point.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2028 (T28), an inflation-linked gilt maturing on 10 August 2028, has fallen sharply relative to its own recent history. Over the past 6 months, the spread generally traded in a band of roughly 0.98% to 1.01%, with only occasional single-day dips. From 22 October 2026, however, it dropped to around 0.05% and has remained at that level through 30 October 2026, the latest data point.

The reading is flagged as an anomaly because it sits well below the statistical lower threshold of 0.30%, which is derived from the six-month mean and standard deviation. The current level is roughly one-twentieth of the typical spread seen across the lookback window. The move is a step change rather than a gradual trend, and the series shows no comparable sustained low during the period.

The implication is that the bond's implicit transaction costs, as measured by the quoted spread, have narrowed considerably, which would suggest tighter dealer quoting and better execution for investors trading it. Because the change is so abrupt and large, however, it should be checked against the underlying quote sources and any changes in market-making or data methodology before being read as a genuine shift in liquidity. The reading warrants monitoring to establish whether the lower spread persists.

The 4¾% Treasury Gilt 2043 (TR43, ISIN GB00BPJJKP77) shows an unusually low bid-ask spread relative to its past six months of trading. The spread stood at 0.443% on 30 October 2026, well below the statistical lower threshold of 0.468%, which sits three standard deviations under the six-month average of roughly 0.54%.

The move was abrupt rather than gradual. Throughout the lookback window the spread mostly ranged between 0.53% and 0.57%. On 22 October 2026 it fell from 0.559% to 0.446% in a single session, a drop of about 20%, and it has remained near that level since. Over the past month, the spread has narrowed from about 0.566% at the end of September to 0.443%, a decline of roughly 22%. Over the past day, it edged down from 0.455% to 0.443%.

For investors, a narrower bid-ask spread means lower implicit transaction costs when buying or selling TR43, and more favourable execution relative to the bond's recent history. The data does not identify the cause of the change, such as a shift in market-making activity, liquidity provision, or trading volumes. The sustained nature of the new level, rather than a single-day outlier, makes it a notable liquidity development for this gilt.

The bid-ask spread on the TG38 (3¾% Treasury Gilt 2038) has fallen to 0.2663% on 2026-10-30, well below the lower threshold of 0.3138% derived from the six-month lookback. Over the past six months, the spread generally moved between about 0.445% and 0.473%, so the current reading sits well outside that recent range.

The decline was abrupt rather than gradual. The spread was 0.4673% on 2026-10-21 and dropped to 0.2683% on 2026-10-22, a fall of roughly 43% in a single session. Since then it has stayed in a tight band of about 0.255% to 0.268%. Over the past day the change was marginal, at under 0.001 percentage points, which indicates the new level has stabilised.

The implication is that the cost of trading this gilt, as measured by the quoted spread, has materially decreased. Lower spreads generally mean reduced transaction costs for investors and tighter pricing between dealer bid and offer quotes. Because the move is a step change rather than a gradual trend, it suggests a discrete shift in quoting or market-making conditions for this bond. The data alone does not identify the cause, so the change should be verified against underlying trading activity before being treated as a lasting improvement in liquidity.

The bid-ask spread on the 0 1/4% Index-linked Treasury Gilt 2052 (TG52) has fallen to 0.96%, well below its typical range over the past six months. The bond traded between roughly 2.2% and 2.7% for most of that period, and the spread sat below the lower anomaly threshold of 1.29% from 22 October 2026 onward. Before that date, the most recent low reading was 1.85% on 18 September, and it quickly reverted.

The change is abrupt rather than gradual. On 21 October the spread stood at 2.53%, and on 22 October it dropped to 0.96%. Since then it has held in a narrow band between 0.95% and 0.97%. Over the past day, the spread moved only marginally, from 0.964% to 0.963%. Compared with the level seen a past month ago, around 2.37% at the end of September, the spread has narrowed by roughly 1.4 percentage points.

For investors, a narrower bid-ask spread means lower implicit transaction costs when buying or selling TG52, suggesting that trading conditions in this inflation-linked gilt have improved significantly. The reading is statistically unusual, falling roughly three standard deviations below its six-month average, so it is worth monitoring to determine whether the shift persists.

The bid-ask spread on the 4 1/8% Treasury Gilt 2031 (T31H, maturing 7 March 2031) has been unusually low relative to its own history. On 30 October 2026 the spread stood at 0.1135%, below the lower anomaly threshold of 0.1674% for the six-month lookback period. Over the preceding six months the spread generally ranged between roughly 0.30% and 0.31%.

The shift was abrupt. The spread fell from 0.3104% on 21 October 2026 to 0.1138% on 22 October 2026, a drop of roughly 0.20 percentage points in a single session. It has since remained in a narrow band of about 0.11% to 0.12%, with the past day showing a marginal decline of about 0.01 percentage points. Compared with the past month, when the spread was near 0.31%, the current level represents a reduction of about 63%.

The sudden and sustained nature of this move suggests a structural change in quoting or trading conditions for this bond rather than gradual market drift. A narrower bid-ask spread implies lower transaction costs for investors trading this gilt and tighter pricing between buyers and sellers. The data alone does not establish the underlying cause, so any attribution to specific market-making activity, liquidity changes or data methodology would require further verification.

The bid-ask spread on the TR40 (0 5/8% Index-linked Treasury Gilt 2040) has fallen sharply and now sits well below its recent range. Over the past 6 months, the spread moved within roughly 1.78% to 1.88%, but on 22 October 2026 it dropped abruptly from 1.852% to 0.505% in a single session. The latest reading of 0.502% on 30 October 2026 is well below the lower anomaly threshold of 0.852%.

Since that break, the spread has remained stable, moving only between 0.503% and 0.516%. This indicates the new level has persisted for the full week rather than reflecting a single outlier print. A bid-ask spread this narrow means buyers and sellers are quoting much closer prices, which implies lower transaction costs for investors trading this inflation-linked gilt.

Because the change is discontinuous rather than gradual, it is worth verifying whether it reflects genuine market conditions, such as changes in dealer competition or liquidity, or a change in quoting or data source. The available data cannot establish the cause. Investors relying on this bond's execution costs, or on the spread as an input to liquidity analysis, should confirm the figure against other sources before drawing conclusions.

The bid-ask spread on the 3¾% Treasury Gilt 2052 (T52) stood at 0.5956% on 30 October 2026. This is unusually low compared with the past 6 months and sits just below the lower anomaly threshold of 0.5987%. Over most of that period the spread traded between roughly 0.65% and 0.71%.

The most notable feature is an abrupt step lower on 22 October 2026, when the spread fell from 0.6855% to 0.5739% in a single session, a decline of about 0.11 percentage points. Since then, the spread has remained within a narrow band of roughly 0.58% to 0.60%, so the lower level has been sustained rather than appearing as a one-off reading. Over the past day, the spread rose modestly by about 0.01 percentage points, from 0.5832% to 0.5956%. Over the past month, it has fallen from 0.7002% on 30 September, a reduction of roughly 0.10 percentage points, or about 15%.

A narrower bid-ask spread indicates a smaller gap between dealer buying and selling prices, which implies lower implicit transaction costs for investors trading the bond. The sharp, discrete nature of the shift and its persistence are the key observable facts. The knowledge base does not identify the underlying cause, so the drivers cannot be determined from this data alone. Continued monitoring would be needed to establish whether this lower spread level is maintained.

The bid-ask spread on the 2½% Treasury Gilt 2065 (TG65), a long-dated conventional gilt maturing on 22 July 2065, has fallen to 0.7536% on 30 October 2026. This is below the lower anomaly threshold of 0.7552% derived from the past six months, and the spread is unusually tight relative to that period.

Through most of the six-month lookback, the spread mostly ranged between roughly 0.92% and 1.02%. It dropped sharply on 22 October 2026 to 0.7439% and has since stayed in a narrow band of about 0.736% to 0.754%. Over the past day, the spread rose slightly by about 0.02 percentage points. Over the past month, it declined from 1.0142% on 30 September to 0.7536%, a fall of roughly 0.26 percentage points, or about 26%.

A narrower bid-ask spread indicates lower implicit transaction costs, which typically signals improved liquidity and tighter pricing for this bond. The persistence of the low level over the last week suggests the shift is not a single-day outlier, unlike the sharp dip to 0.6056% on 17 September 2026, which reverted the following day. The data does not identify the cause of the change, and the spread's future path cannot be inferred from this observation alone.

The bid-ask spread on the 1¼% Treasury Gilt 2051 (T51A, ISIN GB00BLH38158, maturing 31 July 2051) has moved to an unusually low level. The latest observation, on 30 October 2026, is 0.73%, well below the lower threshold of 0.85%, which sits roughly three standard deviations under the bond's recent average of about 1.20%.

Over the past six months, the spread fluctuated within a relatively stable band of about 1.16% to 1.29%, with no comparable sustained move. The defining feature is an abrupt break on 22 October 2026, when the spread fell from 1.24% to 0.74% in a single session. Since then it has stayed within a tight range of roughly 0.71% to 0.73%, indicating that the new level has persisted for about a week rather than reflecting a one-off reading.

The implication is that the cost of immediately buying and selling this gilt has fallen materially. A narrower spread generally signals improved liquidity and tighter quoting, which lowers transaction costs for investors and reduces the price concession needed to execute sizeable orders. Because the shift was sudden and has persisted rather than drifting gradually, it points to a change in trading conditions for this specific line rather than ordinary day-to-day variation. The data alone does not identify the underlying cause, so further information would be needed to judge whether this level will hold.

The bid-ask spread for the T29 (0 1/8% Index-linked Treasury Gilt 2029) has fallen sharply to 0.0713% as of 30 October 2026. It was 1.0183% on 21 October and remained near 1.02% through mid-October, so the drop occurred abruptly on 22 October 2026. Over the past day the spread was unchanged at 0.0713%, while over the past month it has fallen by roughly 0.95 percentage points, or about 93%.

Across the preceding six months, the spread generally traded between about 0.95% and 1.02%, with brief one-day dips, such as 0.9548% on 12 August and 0.9778% on 15 October, that reverted almost immediately. The current reading sits well below the statistical lower threshold of 0.32%, and it has persisted for seven consecutive sessions, so it is not a single-day outlier.

The implication is that the cost of immediately trading this bond, measured by the gap between bid and offer prices, is currently far below its recent norm, which would point to substantially tighter dealer quotes and improved liquidity. However, the sudden and sustained nature of the shift, with no gradual transition, is unusual for a purely market-driven change. The data alone cannot confirm the underlying cause, so it would be prudent to verify whether the move reflects a change in quoting conventions, data source or market structure before relying on it as evidence of genuinely lower trading costs.

The 0 7/8% Treasury Gilt 2029 (TR29, ISIN GB00BJMHB534, maturing 22 October 2029) shows an unusually low bid-ask spread. Over the past six months, the spread stayed in a tight band of roughly 0.33% to 0.34%. On 22 October 2026 it fell abruptly to 0.0786%, and it has since held between about 0.079% and 0.090%, with the latest reading at 0.0896% on 30 October 2026. This is a decline of roughly 73% from the prior level and sits well below the anomaly threshold of 0.152%.

The bid-ask spread measures the difference between the price at which dealers will buy a bond and the price at which they will sell it, so it is a direct indicator of trading cost and liquidity. A spread that has compressed this sharply means that the cost of executing a round-trip trade in this bond has fallen substantially relative to its own history. The step-change on a single day, rather than a gradual drift, is a notable feature of the series. The data provided does not identify the cause of the shift, so the underlying reason cannot be determined from this information alone.

The bid-ask spread on the 3¼% Treasury Gilt 2044 (TG44, ISIN GB00B84Z9V04) stood at 0.4883% on 30 October 2026. This is below the lower anomaly threshold of 0.5314% derived from the bond's six-month history, so the reading is flagged as unusually low.

The spread was broadly stable at around 0.65% to 0.70% for most of the preceding six months. The decline is a sharp step rather than a gradual drift: the spread fell from 0.6860% on 21 October to 0.4788% on 22 October. Since that step, it has traded in a narrow band of roughly 0.477% to 0.492%. Over the past month, the spread has fallen by about 0.21 percentage points, or roughly 30%, and over the past day it has edged down by 0.0013 percentage points.

A narrower bid-ask spread indicates lower transaction costs and tighter pricing between dealer bid and offer quotes, which generally signals improved liquidity in the bond. The abrupt, persistent nature of the shift points to a discrete change in quoting conditions rather than normal short-term noise. The provided data does not identify the underlying cause, so further information would be needed to attribute the move.

The bid-ask spread on the T33 Index-linked Treasury Gilt 2033 fell sharply on 22 October 2026, dropping from 1.2401% on 21 October to 0.2753%. It has remained near that level, closing at 0.2746% on 30 October. Over the past month, the spread has declined by roughly 0.98 percentage points from 1.2515% on 30 September, and over the past day it has edged down by about 0.0005 percentage points.

Over the preceding six months, the spread typically ranged between about 1.06% and 1.28%, with its lowest reading at 1.0627% on 26 August. The current value of 0.2746% sits well below the anomaly threshold lower bound of 0.5157%, and its standard deviation-based coefficient flags it as a statistically unusual low.

The abrupt, persistent step change, rather than a gradual move, suggests the shift may reflect a structural factor, such as a change in market-making conditions, quote sourcing, or data methodology, rather than a normal fluctuation in liquidity. A spread this tight would lower transaction costs for investors trading the bond, but the anomaly should be verified against the underlying quote data before being relied upon for pricing or liquidity assessments.

The TG41 (1¼% Treasury Gilt 2041) bid-ask spread has been flagged as an unusually low anomaly, with the latest reading at 0.39% on 30 October 2026. This is below the lower anomaly threshold of roughly 0.48%, which the flag reflects. Over the past six months, the spread generally held between about 0.67% and 0.73%.

The decline was abrupt rather than gradual. The spread fell from 0.71% on 21 October to 0.52% on 22 October and 0.39% on 23 October. Over the past month, it has dropped from about 0.72% at the end of September to 0.39%, a reduction of roughly 0.33 percentage points, or close to 46%. Over the past day, it was essentially unchanged, moving from 0.389% to 0.3875%, which suggests the new level has been stable since the step change.

Implications: a narrower bid-ask spread means that buying and selling TG41 now carries a lower implicit transaction cost than it did earlier in the period. The sudden, sustained shift points to a change in how the bond is being quoted or traded, rather than normal day-to-day fluctuation. The data alone does not identify the cause, so the move should be monitored to confirm whether the lower spread persists.

The 4% Treasury Gilt 2029 (T29K, maturing 22 May 2029) shows an anomalously low bid-ask spread relative to the past six months. The spread fell from 0.3067% on 21 October 2026 to 0.0716% on 22 October 2026, and it has stayed near that level since. Over the past day, it was essentially unchanged, moving from 0.0716% to 0.0715%. Over the past month, it declined from 0.3066% to 0.0715%, a fall of roughly 77%.

Before the break, the spread traded in a narrow band of about 0.30% to 0.31% throughout the six-month lookback. The current reading of 0.0715% sits well below the anomaly threshold of 0.1337%. The only deviation since the shift was a brief uptick to 0.0818% on 27 October 2026, which reversed the following day. The abrupt, step-like nature of the change, rather than a gradual narrowing, is what distinguishes this episode.

A spread at this level implies that the cost of immediately trading the bond, measured as the gap between bid and ask prices, has fallen substantially. The persistence of the new level over several sessions suggests a sustained shift in quoted pricing rather than a transient move. The data alone does not identify the cause of the change, so its underlying drivers cannot be determined from this analysis.

The bid-ask spread on the 0 3/8% Treasury Gilt 2030 (TG30, ISIN GB00BL68HH02) has fallen to unusually low levels. Over the preceding six months, the spread traded in a tight range of roughly 0.35% to 0.36%. It then dropped sharply to 0.1191% on 2026-10-22 and has remained near that level since. The latest reading is 0.1187%, which sits below the statistical lower threshold of 0.1787% derived from the six-month lookback.

Over the past month, the spread has declined by roughly 0.24 percentage points, from about 0.358% at the end of September to 0.119%, a fall of around two-thirds. Over the past day, the spread edged up from 0.1071% to 0.1187%, a rise of about 0.012 percentage points, though it remains well below its prior range.

A narrower bid-ask spread indicates that the cost of trading the bond between buyer and seller has decreased, which generally points to tighter pricing and greater liquidity. The sustained nature of the shift, rather than a single-day move, makes it a notable anomaly. The data provided does not identify the cause of the change, so this analysis does not attribute it to any specific market event.

The bid-ask spread on the 4¼% Treasury Gilt 2049 (T49, maturing 7 December 2049) is unusually low relative to its recent history. The latest reading of 0.5388% is below the statistical lower threshold of 0.5483%, and the spread is well under its typical level of roughly 0.61% over the lookback window.

Over the past six months, the spread mostly ranged between 0.58% and 0.63%, and no reading fell below 0.5858% before the recent move. The most notable feature is a sharp step change on 22 October 2026, when the spread dropped from 0.6193% to 0.5433% in a single session. It has since held in a narrow band of roughly 0.539% to 0.543%.

Over the past month, the spread has fallen by about 0.09 percentage points, from 0.631% on 30 September to 0.5388% on 30 October. Over the past day, it has been broadly stable, moving down by less than 0.01 percentage points.

The implication is that the cost of transacting immediately in this bond, measured as the gap between bid and offer prices, has decreased materially. A narrower spread generally indicates better liquidity and lower trading costs for investors, and suggests that market makers are quoting more competitively. Because the shift was abrupt rather than gradual, it points to a discrete change in market conditions or quoting behaviour for this specific line rather than a broad trend across the curve. The data does not identify the underlying cause, and the persistence of the lower level should be monitored before drawing firmer conclusions.

The bid-ask spread on the 0 5/8% Treasury Gilt 2050 (TG50) stood at 0.79% on 30 October 2026, unusually low relative to the past 6 months. It falls below the lower statistical threshold of approximately 0.96%, which is derived from the six-month baseline.

Through 21 October 2026 the spread had moved within a range of roughly 1.4% to 1.6%. It then dropped sharply to 0.80% on 22 October 2026, a step change of about 0.69 percentage points in a single session rather than a gradual trend. Over the past day, the spread edged down from 0.7947% to 0.7928%, so the new level has been broadly stable since the break. Over the past month, the spread has compressed by about 0.75 percentage points, roughly half its prior level.

A narrower bid-ask spread indicates lower transaction costs and tighter quoted pricing for investors trading this long-dated conventional gilt, which matures in October 2050. The abruptness of the shift points to a structural or market-specific change rather than normal fluctuation, although the available data do not identify its cause. Confirming whether the change reflects a genuine improvement in liquidity or a data or methodology revision would help determine how representative the lower spread is.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2044 (ticker T44) has fallen sharply to an unusually low level. Over the past six months, the spread moved within a fairly stable range of roughly 2.1% to 2.3%, with a mean near 2.13% and a standard deviation of about 0.35 percentage points. On 22 October 2026 it dropped abruptly to 0.6826%, and it has remained between 0.675% and 0.68% since then, ending the series at 0.6753% on 30 October 2026.

The latest reading sits well below the lower anomaly threshold of 1.08%, roughly three standard deviations under the six-month average. The break is a single-day step change rather than a gradual decline, and it has persisted for about six trading sessions, so it does not appear to be a one-off fluctuation.

A narrower bid-ask spread means the gap between the prices at which dealers will buy and sell the bond is smaller. For an investor, this points to lower implicit trading costs on this inflation-linked gilt. The data alone does not identify the cause of the shift, whether it reflects changes in market-making conditions, liquidity, or the quoting and data sources behind the series. Investors monitoring this bond should verify the underlying quotes before drawing conclusions about its trading conditions.

The bid-ask spread on the TR39 gilt (1 1/8% Treasury Gilt 2039, maturing 31 January 2039) stood at 0.3227% on 30 October 2026. This is unusually low relative to the past six months, and it sits below the lower threshold of 0.409%, which is the basis for the anomaly flag.

The spread was fairly stable between roughly 0.62% and 0.66% from late April through 21 October 2026. It then fell sharply to 0.326% on 22 October, a single-day step rather than a gradual drift. Over the past month, the spread has declined by about 51%, from 0.659% on 30 September. Over the past day, it fell by about 0.017 percentage points, or roughly 5%, from 0.3401%. Since the step change, the spread has held in a narrow band of about 0.32% to 0.34%.

A narrower bid-ask spread indicates that the cost of immediately trading the bond has fallen, which typically reflects tighter dealer quoting and better secondary-market liquidity. The abrupt nature of the change, occurring on one date and persisting thereafter, suggests a discrete change in quoting or market conditions for this specific line rather than a gradual shift in overall market activity. The data alone does not identify the cause, so it is worth confirming whether the change reflects genuine market conditions or a change in data sourcing or methodology before drawing conclusions about the bond's liquidity profile.

The bid-ask spread on the 1 1/8% Treasury Gilt 2073 (TR73), a conventional long-dated gilt maturing on 22 October 2073, fell to 0.99% on 30 October 2026. This is below the 6-month anomaly threshold of about 1.12%, making it an unusually low reading relative to recent history.

Until 21 October 2026, the spread generally traded between roughly 1.56% and 1.87%. The only earlier reading near these levels was a single dip to 1.02% on 17 September 2026, which reverted the next day. The current move is more persistent: the spread dropped from 1.74% to 1.00% on 22 October 2026 and has since stayed between 0.96% and 1.00%. Over the past day, it was virtually unchanged at 0.99%, while over the past month it has narrowed by roughly 0.8 percentage points from 1.81% on 30 September 2026.

Because the bid-ask spread measures the cost of trading immediately, a sustained narrowing indicates that quoted prices on this bond have tightened. This points to lower trading costs for investors in the bond. The data does not identify the cause of the change, and the persistence of the lower spread over several sessions distinguishes it from the earlier one-day outlier.

The bid-ask spread on the 1¼% Index-linked Treasury Gilt 2055 (TR8F, maturing 22 November 2055) fell to 0.94% on 30 October 2026, well below its typical range over the past 6 months. Over that period the spread generally held between about 1.6% and 2.0%, with a six-month average of roughly 1.85%. The latest reading sits below the lower anomaly threshold of 1.11%, roughly three standard deviations under the average.

The move was abrupt. The spread dropped from 1.76% on 21 October to 0.93% on 22 October and has since stayed in a narrow band of about 0.92% to 0.94%. Before this shift, the series had not closed below 1.5% in the six-month window, apart from a few isolated dips. The persistence of the new level, rather than a single-day outlier, distinguishes this movement from the usual day-to-day noise in the series.

A narrower bid-ask spread means the cost of trading the bond has fallen relative to recent conditions, which generally indicates tighter pricing and better liquidity for this index-linked issue. The data alone does not identify the cause, so the change should be monitored and verified against trading volumes and quoting activity before drawing firm conclusions.

The bid-ask spread on the T32 (1¼% Index-linked Treasury Gilt 2032, maturing 22 November 2032) has fallen to an unusually low level. Over the past 6 months, the spread moved within a fairly narrow band of roughly 1.46% to 1.52%, with a gradual upward drift through the summer and early autumn. It was still around 1.51% on 21 October 2026.

On 22 October 2026, the spread dropped abruptly to 0.18%, and it has since remained near 0.17%, with the latest reading at 0.17% on 30 October 2026. Compared with the past month, when the spread was above 1.5%, this represents a reduction of roughly 1.3 percentage points. The current level sits well below the lower anomaly threshold of 0.52% derived from the six-month distribution, which is why the observation has been flagged as a low anomaly.

The implication is that, at present, the cost of executing an immediate round-trip trade in this bond is substantially lower than it was for most of the previous six months, which would generally point to tighter pricing and improved liquidity for market participants. However, the change is very sudden rather than gradual, and the data alone does not show whether it reflects a shift in market-making conditions, a change in quoting or data-sourcing conventions, or another factor. Because a step change of this size is atypical for this measure, the reading should be verified against the underlying quote data before it is relied upon.

The bid-ask spread on the T41 (0 1/8% Index-linked Treasury Gilt 2041, ISIN GB00BGDYHF49) is unusually low relative to its own history. Over the past six months, the spread typically ranged between roughly 0.9% and 1.2%, with a stable central level near 1.1%. The anomaly threshold for this period sits at about 0.68%, and the latest reading of 0.58% on 2026-10-30 falls below that lower bound.

The change is abrupt rather than gradual. The spread was about 1.15% on 2026-10-21 and dropped to 0.58% on 2026-10-22. It has since held in a narrow range of roughly 0.57% to 0.59% across the following six sessions, indicating that the new level is persistent rather than a one-day outlier.

A narrower bid-ask spread implies lower implicit trading costs for investors and a tighter quoted market for this inflation-linked gilt. Because the shift occurred in a single step and has been sustained, it points to a change in quoting conditions for the bond rather than normal day-to-day variation. The data alone does not identify the underlying cause, so the observation should be treated as a factual deviation from recent behaviour that warrants monitoring.

The bid-ask spread on the 1½% Treasury Gilt 2047 (TG47) has moved to an unusually low level. Over the six-month lookback, the spread mostly fluctuated between roughly 0.76% and 1.03%, with a typical level near 0.93%. Its lowest previous reading was 0.7612% on 28 August 2026.

On 22 October 2026, the spread fell sharply from 0.8656% to 0.6367%. It has since remained in a narrow band of about 0.63% to 0.65%, with the latest observation at 0.6505% on 30 October 2026. This sits below the statistical lower threshold of 0.6575% and is roughly two standard deviations below the six-month average.

Over the past month, the spread has been markedly tighter than in the preceding period, indicating a persistent rather than a one-day move. Because the bid-ask spread measures the cost of immediately trading the bond, a narrower spread implies lower transaction costs and a more competitive quoting environment for this gilt. The stability of the new level suggests the change is sustained rather than a transient quoting anomaly.

The dataset does not identify the cause of the shift, so any explanation would be speculative. Investors monitoring TG47 should note that its execution costs are currently lower than at any point in the past six months.

The bid-ask spread on the Treasury Gilt 2039 (T39, 4¼% coupon, maturing 7 September 2039) has narrowed sharply, falling to 0.2811% on 30 October 2026. This is unusually low relative to the past six months, when the spread generally traded between about 0.43% and 0.46%. The reading sits below the lower anomaly threshold of roughly 0.33%, a level that the bond has not reached in the lookback window.

The change was abrupt rather than gradual. The spread was 0.4539% on 21 October 2026 and dropped to 0.2833% on 22 October 2026, a decline of roughly 38% in a single session. It has remained in a lower range of about 0.28% to 0.29% since then. Over the preceding months, the series showed only modest movement, so this step change stands out clearly against its recent history.

The bid-ask spread is a measure of trading cost and liquidity. A narrower spread means that buyers and sellers are quoting closer prices, which implies lower implicit transaction costs for investors trading the bond. On this basis, the data indicates improved liquidity conditions for T39 compared with its recent trading history.

Because the shift is sudden and not accompanied by a corresponding change in the bond's static characteristics, it is worth confirming whether the new level persists over subsequent sessions. The data alone does not identify the underlying cause of the change.

The 4¼% Treasury Gilt 2034 (TS34, maturing 31 July 2034) shows a bid-ask spread of 0.2012% as of 30 October 2026. This is unusually low relative to the past six months and falls below the anomaly's lower threshold of 0.2535%. Over the past six months, the spread generally held between roughly 0.41% and 0.43%, with a gradual drift lower through June and early July before partially recovering.

The change is abrupt. On 22 October 2026, the spread fell from 0.4259% to 0.2022%, a decline of about 52% in a single session. It has since remained in a narrow band of roughly 0.19% to 0.20%. Over the past month, the spread has therefore stayed at roughly half its prior level, with little day-to-day movement.

A narrower bid-ask spread means the cost of executing a round-trip trade in this gilt is lower, which generally indicates tighter quoted pricing and stronger liquidity relative to its own recent history. The step change, rather than a gradual shift, suggests a structural change in quoting conditions rather than ordinary market noise. The data alone does not identify the cause, and the persistence of the lower level will need to be confirmed in subsequent observations before it can be treated as a durable trading characteristic.

The T38 bid-ask spread, measured for the 1¾% Index-linked Treasury Gilt 2038 (ISIN GB00BMY62Z61), shows an unusually low reading relative to its past six months. Over that lookback window, the spread generally moved between roughly 0.8% and 1.1%, with a mean near 1.0%. On 2026-10-22 it fell sharply from 1.0648% to 0.4272%, and it has since remained in a tight band of about 0.42% to 0.43%, closing at 0.4248% on 2026-10-30.

The latest reading sits well below the lower anomaly threshold of 0.57%, roughly four standard deviations under the six-month average. The change was a discrete step rather than a gradual decline, and it has persisted for seven consecutive sessions instead of reverting to the prior range. This pattern indicates a sustained shift in the bond's quoted trading costs rather than a one-off quote anomaly.

A narrower bid-ask spread means the price difference between buying and selling the bond has compressed by more than half, which implies lower implicit transaction costs for investors trading this inflation-linked gilt. The dataset does not identify the underlying cause, so the reason for the change cannot be determined from the available data. Continued monitoring would be needed to establish whether the new level is maintained.

The bid-ask spread on the TG27 gilt (1¼% Treasury Gilt 2027, maturing 22 July 2027) has fallen to an unusually low level, standing at 0.0204% as of 30 October 2026. This reading is well below the lower threshold of 0.0703% for the six-month lookback period, which flags it as a low-direction anomaly.

The spread had been relatively stable at around 0.205% to 0.208% from late April through 21 October 2026, drifting gradually lower. On 22 October 2026 it dropped abruptly to 0.0205% and has remained near that level since. Over the past month, the spread has declined by roughly 90%, from about 0.205% at the end of September. Over the past day, it was essentially unchanged at 0.0204%, apart from a one-day spike to 0.0307% on 27 October 2026 that reverted immediately.

The implications are twofold. A tighter spread generally indicates lower transaction costs and better execution for investors trading this bond, which would be consistent with stronger liquidity or more competitive market-making. However, the magnitude and abruptness of the shift, occurring in a single session and persisting for more than a week, differ from the gradual movement seen previously. This pattern is more consistent with a change in quoting conventions or data source than with a gradual market development, so the figures should be verified against the underlying quote feed before being relied upon for pricing or liquidity assessments.

The bid-ask spread on the 3¾% Treasury Gilt 2053 (T53) has fallen to 0.6028%, which is unusually low compared with the past six months. The current value sits below the lower anomaly threshold of 0.6078%, roughly three standard deviations under the six-month average of about 0.68%, and is therefore classified as a low anomaly.

The decline was abrupt rather than gradual. Before 22 October, the spread had generally held between about 0.65% and 0.72%. On that date it dropped from 0.6943% to 0.5947%, a fall of roughly 0.10 percentage points in a single session. Over the past month, the spread has narrowed from 0.7093% to 0.6028%, about 15% lower, and it has since traded in a tight band of roughly 0.59% to 0.61%. Over the past day, it widened slightly by 0.0125 percentage points, from 0.5903%.

A narrower bid-ask spread lowers the implicit cost of trading the bond, which points to improved liquidity or more competitive quoting by market makers in this line. Because the shift was a sudden level change that has persisted, it suggests a change in market conditions or quoting behaviour rather than short-term noise. The data does not identify the underlying cause, and it cannot confirm whether the new level will be sustained.

The bid-ask spread on the 2% Index-linked Treasury Stock 2035 (ticker T2IL) has fallen sharply and is now unusually low relative to its own history. Over the past 6 months, the spread ranged roughly between 0.73% and 0.75%, with a six-month mean of about 0.72%. On 22 October 2026 it dropped from 0.7467% to 0.3023%, and it closed the period at 0.3048% on 30 October 2026.

The current reading sits well below the statistical lower threshold of 0.419%, about three standard deviations under the six-month average. The move was abrupt rather than gradual: the spread was stable above 0.74% for the preceding months, then stepped down in a single session. Since then it has held in a tight band of roughly 0.30% to 0.31%, which indicates a sustained shift rather than a one-day outlier.

For investors, a narrower bid-ask spread means a lower implicit transaction cost when buying or selling this inflation-linked gilt. The spread has roughly halved compared with its prior level, so the bond is currently trading with markedly better liquidity conditions than its recent norm. The data does not identify the underlying cause, so the observation should be treated as a factual change in quoted trading costs that warrants continued monitoring.

The bid-ask spread on the 0 7/8% Treasury Gilt 2046 (TG46, ISIN GB00BNNGP775, maturing 31 January 2046) has fallen to 0.66% as of 30 October 2026. This is unusually low compared with the preceding six months, when the spread generally moved between roughly 1.08% and 1.19%, and the current reading sits well below the 0.77% lower threshold flagged by the anomaly model.

The decline was abrupt rather than gradual. On 21 October the spread was 1.15%, and on 22 October it dropped to 0.64%, a fall of about 0.52 percentage points in a single session. Over the past month, the spread has narrowed from 1.18% at the end of September to 0.66%, a reduction of roughly 44%. Over the past day, it eased marginally from 0.66% to 0.66%, a change of about 0.002 percentage points, indicating that the new level has stabilised.

The data show that the lower spread has persisted for about seven consecutive trading days, so it does not appear to be a one-off reading. A narrower bid-ask spread means that the cost of immediately buying and selling this bond is lower, which generally points to improved liquidity or tighter market-maker quoting for this specific gilt. The dataset does not identify the underlying cause, so the reason for the shift cannot be determined from the information provided.

The bid-ask spread on the T30 gilt (4 3/8% Treasury Gilt 2030) shows a sharp break in the past six months. From late April to 21 October 2026, the spread stayed in a narrow band of roughly 0.298% to 0.306%, with little variation around its average level.

On 22 October 2026, the spread fell abruptly to 0.0917%, a drop of about 70% from the prior day's 0.3055%. It has remained close to that level since, at 0.0915% on 30 October 2026. The reading is flagged as an anomaly because it sits well below the lower threshold of 0.1479%, which is calculated from the six-month lookback period. The move was a single step change rather than a gradual decline, and it persisted across subsequent sessions.

A narrower bid-ask spread means the gap between buying and selling prices has tightened considerably, which typically indicates lower trading costs for investors in this bond. The dataset does not identify the cause of the shift, so it cannot distinguish between a change in market liquidity and a change in how quotes are recorded or sourced. Investors and analysts relying on T30 pricing data may wish to verify the underlying quote source before drawing conclusions about its trading conditions.

The T41F (5¼% Treasury Gilt 2041, maturing 31 January 2041) has a bid-ask spread of 0.2983%, which is unusually low relative to its behaviour over the past six months. The reading sits below the lower anomaly threshold of 0.316%, roughly three standard deviations beneath its six-month mean of about 0.40%.

The move looks like a level shift rather than a one-off outlier. From 30 April to 21 October 2026, the spread generally traded between about 0.37% and 0.42%, with occasional single-day dips that reverted quickly. On 22 October 2026 it fell from 0.405% to 0.2902% and has since stayed in a band of roughly 0.289% to 0.300%. Over the past month, the spread narrowed by about 0.12 percentage points (from 0.4183% to 0.2983%), and over the past six months by about 0.11 percentage points. Over the past day it rose by roughly 0.01 percentage points.

A tighter bid-ask spread indicates lower relative trading costs for this bond, consistent with narrower dealer quotes. Because the compression has persisted across several sessions, it is not a single-day anomaly. The dataset, however, does not identify the cause of the change. Its durability will determine whether it reflects a lasting shift in trading conditions for T41F.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2046 (TR46, maturing 22 March 2046) is unusually low relative to its recent history. Over the six-month lookback, the spread mostly ranged between roughly 1.8% and 2.4%, averaging approximately 2.1% with a standard deviation of about 0.34 percentage points. The latest reading of 0.74% on 30 October 2026 sits well below the lower anomaly threshold of 1.05%.

The break was abrupt. The spread stood at 1.98% on 21 October 2026 and fell to 0.75% on 22 October, a drop of about 1.2 percentage points in a single session. Since then, it has held in a narrow band of roughly 0.74% to 0.76%. Over the past day, the change was negligible (from 0.7436% to 0.7425%), but compared with the past month, when the spread was above 2% for most sessions, the reduction is substantial.

A lower bid-ask spread means that the cost of buying and selling this bond, relative to its quoted mid-price, has fallen considerably. Because the shift was sudden and has persisted across consecutive sessions, it points to a change in quoting behaviour or market conditions rather than ordinary day-to-day noise. The dataset does not identify the underlying cause, and it cannot confirm whether the lower level will be sustained.

The bid-ask spread on the T47 (0 3/4% Index-linked Treasury Gilt 2047) has fallen to a level well below its recent range, flagged as a low-side anomaly. Through October 21, 2026, the spread typically ranged between roughly 1.7% and 2.1%. On October 22 it dropped sharply to 0.7625%, and it has remained between about 0.755% and 0.761% since. The latest reading of 0.755% sits far below the 6-month anomaly threshold band of approximately 1.00% to 2.69%.

Over the past month, the spread has narrowed by roughly 1.2 percentage points, about 60%. Over the past day, the change has been negligible, with the spread moving only from 0.7554% to 0.755%. This indicates the new level is persistent rather than a single-session outlier, having held for about six consecutive trading days.

The implication is that trading the T47 is currently much cheaper in terms of implicit transaction cost, which generally points to improved liquidity or tighter quoting conditions for this index-linked gilt. Because the shift is abrupt and sustained, it represents a clear structural break in the bond's trading profile relative to its prior six months. The dataset does not identify the underlying cause, so any assessment of its durability should await further observations.

The bid-ask spread on the 1½% Green Gilt 2053 (TG53, maturing 31 July 2053) has followed a downward trend over the past month, with the spread narrowing from around 1.1% to roughly 0.76% by 30 October. The regression coefficient of -0.023 indicates a clear decline in the spread over the period.

Most of the decline came in a single step. The spread held in a range of about 1.13% to 1.21% through 21 October, then fell to 0.74% on 22 October, a drop of roughly 0.4 percentage points in one session. It has stayed between 0.73% and 0.76% since then, suggesting the lower level has been fairly stable rather than continuing to fall.

For investors, a narrower bid-ask spread means a lower implicit cost of trading this bond. Buying and selling at prices closer to each other reduces round-trip transaction costs, which is relevant for both active traders and institutions rebalancing positions. The move also indicates that quoted prices for this green gilt have become more tightly aligned between buyers and sellers. The data alone does not identify the cause of the change, and it should be read as a description of quoted liquidity rather than a forecast of future trading conditions.

The 4% Treasury Gilt 2031 (T31) shows a sharp narrowing in its bid-ask spread over the past month. The spread stood at roughly 0.31% through 21 October 2026, then fell to about 0.14% on 22 October and has remained near that level since, closing at 0.1356% on 30 October. This is a decline of roughly 0.18 percentage points, or about 57%, and it is the main driver of the downward trend identified in the data, with a fitted trend coefficient of approximately -0.0099 per day.

The bid-ask spread measures the gap between the prices at which dealers will buy and sell the bond, so it is a direct indicator of trading cost and liquidity. A spread that falls by more than half, as seen here, implies that buying and selling T31 has become considerably cheaper for market participants. The move is a step change rather than a gradual drift, with the series remaining flat on either side of 22 October, which suggests a discrete shift in the bond's quoting conditions rather than a steady build-up over the month. The data does not identify the cause of this shift. The bond's static details (issued 29 February 2024, maturing 22 October 2031, 4% coupon) do not explain it.

The TG35 (0⅝% Treasury Gilt 2035) bid-ask spread followed a downward trend over the past month, falling from approximately 0.59% at the start of the period (30 September 2026) to 0.249% on 30 October 2026. This represents a decline of roughly 0.35 percentage points, or about 58%.

The decline was not gradual. The spread held in a narrow range of about 0.59% to 0.60% through 21 October 2026, then dropped sharply to 0.2508% on 22 October 2026, a single-day fall of roughly 0.34 percentage points. From that point, the spread stayed in a tight band of about 0.249% to 0.251% for the remainder of the period, indicating that the lower level has been stable since the break.

The bid-ask spread measures the difference between the price at which dealers will buy a bond and the price at which they will sell it, so it is a key indicator of trading cost and liquidity. A narrower spread means that investors transacting in TG35 face lower implicit costs, and that quoted prices are more tightly aligned between buyers and sellers. The fact that the spread has settled at a materially lower level suggests a structural change in how this bond is quoted, rather than a temporary fluctuation. The dataset does not identify the specific cause of the shift, so further information would be required to attribute it.

The bid-ask spread on the 4¼% Treasury Gilt 2039 (T39) has followed a downward trend over the past month, falling from approximately 0.457% on 30 September 2026 to 0.281% on 30 October 2026, a decline of roughly 38%. The fitted trend coefficient of -0.0094 per day exceeds its threshold in magnitude, which confirms that the decline is statistically meaningful rather than day-to-day noise.

The move was not gradual. The spread held in a narrow band of about 0.453% to 0.460% from early September until 21 October, then dropped sharply to 0.283% on 22 October. It has since remained in a tighter range of roughly 0.28% to 0.29%. This single-day step change, rather than a steady tightening, accounts for most of the monthly decline.

For investors, a narrower bid-ask spread means the cost of executing a round-trip trade in this bond is lower, which points to improved relative liquidity or more competitive quoting for this long-dated conventional gilt. The data alone do not identify the cause of the step change on 22 October, and they do not indicate whether the lower spread level will persist.

The bid-ask spread on the TR39 gilt (1 1/8% Treasury Gilt 2039, a conventional bond maturing in January 2039) has followed a downward trend over the past month, falling from about 0.66% on 30 September 2026 to 0.32% on 30 October 2026. This is a decline of roughly half in the quoted spread, and the negative trend coefficient of -0.018 reflects a consistent drop across the lookback window.

The decline was not gradual. The spread stayed in a narrow band of roughly 0.65% to 0.66% through 21 October, then stepped down sharply to 0.326% on 22 October 2026. Since then it has remained in a tighter range of about 0.32% to 0.34%. Over the past day, the spread narrowed slightly from 0.3401% to 0.3227%, a fall of about 0.017 percentage points.

A narrower bid-ask spread means a lower implicit cost for buying and selling the bond, which points to improved liquidity or tighter dealer pricing for TR39. The abrupt, discrete nature of the shift suggests a change in trading conditions around 22 October rather than a slow build-up. The dataset does not identify the cause, nor does it show whether the lower level will persist.

The bid-ask spread on the 4 1/8% Treasury Gilt 2033 (T33H) has followed a downward trend over the past month. Between 30 September and 30 October 2026, the spread held within a narrow band of about 0.316% to 0.318% until 21 October, then fell sharply to about 0.169% on 22 October. From that point it stayed between roughly 0.158% and 0.169%.

The fitted trend coefficient of approximately -0.0084 has a magnitude above the stated threshold of 0.0063, which indicates that the decline is a meaningful trend rather than day-to-day noise. The step change is the dominant feature: the spread roughly halved in a single session. This points to a discrete shift in quoting conditions or liquidity rather than a gradual tightening.

A narrower bid-ask spread reduces the implicit transaction cost of trading the bond and suggests more competitive dealer pricing. For investors, this means lower costs for entering or exiting positions in this issue. The data are descriptive and do not identify the cause of the change, so additional market information would be needed to explain it.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2046 (TR46) followed a downward trend over the past month, falling from approximately 2.39% on 30 September 2026 to 0.74% on 30 October 2026, a decline of roughly 69%. The inflation-linked bond, which matures on 22 March 2046, had spreads mostly between 1.9% and 2.4% before the change.

The most notable feature is an abrupt step change on 22 October 2026, when the spread fell from 1.98% to 0.75% in a single session. Since then, the spread has stayed within a narrow range of about 0.74% to 0.76%, suggesting the lower level has persisted rather than reverting. The fitted trend coefficient of approximately -0.08 per day confirms the downward direction over the lookback window.

The bid-ask spread measures the gap between the prices at which dealers will buy and sell a bond. A narrower spread generally indicates improved liquidity and lower implicit transaction costs for investors trading this security. The data does not identify the cause of the shift, so the source of the change cannot be determined from the available information. Relative to the preceding weeks, the cost of trading TR46 is now substantially lower.

The bid-ask spread of the 0 1/8% Index-linked Treasury Gilt 2031 (TR31, maturing 2031-08-10) followed a downward trend over the past 1 month, narrowing from roughly 1.05% to 0.14% by 2026-10-30. The fitted linear trend has a slope coefficient of approximately -0.050, and its magnitude exceeds the stated threshold of 0.021, so the decline is a sustained directional move rather than day-to-day noise.

For most of the window, the spread was broadly stable, fluctuating between about 1.04% and 1.06% from 2026-09-30 to 2026-10-21. The decline is concentrated in a single abrupt step. On 2026-10-22 the spread fell from 1.0504% to 0.1469%, a drop of about 86% in one session. It has since remained in a narrow band of roughly 0.13% to 0.15%, with only minor movements.

A bid-ask spread measures the cost of immediately buying and selling a security, so a narrower spread indicates lower transaction costs and tighter pricing for this bond. Because the change is a discrete break rather than a gradual convergence, the data points to a shift in quoted pricing conditions at a specific date, which investors tracking this gilt's liquidity should note.

The 1¼% Index-linked Treasury Gilt 2055 (TR8F) shows a clear downward trend in its bid-ask spread over the past month, narrowing from about 1.86% on 30 September 2026 to 0.94% on 30 October 2026. The fitted trend coefficient of approximately -0.05 per observation, which exceeds its threshold, indicates that the decline is systematic rather than day-to-day noise.

Until 21 October 2026, the spread was broadly range-bound between roughly 1.55% and 2.03%. The most notable feature is a sharp step-down on 22 October, when it fell from 1.758% to 0.935% in a single session. Since then, the spread has held in a tight band of approximately 0.92% to 0.94%, indicating that the lower level has been sustained rather than being a one-off move.

The practical implication is that the cost of trading TR8F, measured as the gap between dealer bid and offer prices, has roughly halved over the period. A narrower bid-ask spread generally points to improved liquidity and tighter pricing for investors entering or exiting positions, and it lowers transaction costs for this inflation-linked gilt. The abrupt nature of the change on 22 October marks a discrete shift in the bond's quoted spread, although the data alone do not identify the underlying cause.

The bid-ask spread on the 1¼% Treasury Gilt 2051 (T51A) has followed a clear downward trend over the past month, falling from 1.2762% on 30 September 2026 to 0.7312% on 30 October 2026. That is a decline of roughly 0.55 percentage points, or about 43%. The fitted trend slope of -0.031 percentage points per observation exceeds the defined threshold of 0.026, so the decline is meaningful rather than ordinary day-to-day noise.

The movement was not gradual. The spread traded between roughly 1.24% and 1.29% through 21 October 2026, then dropped sharply to 0.7404% on 22 October, a single-day fall of about 40%. Since that step change, the spread has stayed in a narrow band of about 0.71% to 0.73%. This suggests the bond has settled at a materially lower level rather than continuing to decline.

The bid-ask spread measures the gap between buying and selling prices. A narrower spread implies lower transaction costs for investors trading this long-dated conventional gilt, and it generally points to improved liquidity and tighter pricing by market makers. The data does not identify the cause of the shift, so any explanation would require additional information.

The bid-ask spread on the 0¾% Index-linked Treasury Gilt 2033 (T33) has followed a downward trend over the past month, falling from about 1.25% on 30 September 2026 to 0.27% on 30 October 2026, a decline of roughly 78%. The negative slope coefficient of -0.054 exceeds the 0.025 threshold, supporting the statistical significance of the downward direction.

The movement was not gradual. Between 30 September and 21 October, the spread fluctuated within a band of roughly 1.18% to 1.28%. It then dropped abruptly from 1.24% on 21 October to 0.28% on 22 October. Since that step change, the spread has stayed between 0.26% and 0.28%, which points to a new level rather than a continuing decline.

The implication is that the cost of immediately trading T33, measured as the gap between bid and offer prices, has fallen substantially, so the bond appears more liquid on a quoted basis. Because the shift occurred in a single session, it may reflect a change in quoting conventions, market-making arrangements or data source rather than a gradual change in trading activity. The dataset alone cannot distinguish these explanations, so pre- and post-22 October figures should be compared with caution.

The bid-ask spread on the T34 (4 5/8% Treasury Gilt 2034) has followed a downward trend over the past month, falling from 0.4143% on 30 September 2026 to 0.1853% on 30 October 2026. This is a decline of about 0.229 percentage points, or roughly 55%.

The movement was not gradual. The spread held in a narrow range of about 0.41% to 0.42% until 21 October, then dropped sharply to 0.1861% on 22 October. It has remained close to that level since, at 0.1857% to 0.1861% for most of the period. The past day saw a small dip to 0.1754% on 29 October, followed by a partial rebound to 0.1853% on 30 October, a change of about 0.01 percentage points.

The implication is that the cost of immediately trading T34 has fallen materially, since a narrower bid-ask spread generally means lower transaction costs and better execution for buyers and sellers. Because the change was a single step rather than a steady improvement, it points to a discrete change in quoting conditions instead of a gradual build-up in liquidity. The dataset does not identify the cause, so any further conclusions would require additional information.

The TG30 (0 3/8% Treasury Gilt 2030) bid-ask spread has followed a downward trend over the past month, falling from 0.3582% on 30 September 2026 to 0.1187% on 30 October 2026, a decline of roughly two-thirds. The decrease was not gradual. The spread held in a narrow range of about 0.357% to 0.358% until 21 October, then dropped to 0.1191% on 22 October, the bond's maturity anniversary date (the bond matures on 22 October 2030). It has since stayed close to that lower level, between 0.107% and 0.119%.

Over the past day, the spread widened slightly, rising from 0.1071% to 0.1187%, an increase of about 0.012 percentage points. This is a small move compared with the monthly change and leaves the spread well below its level at the start of the period.

For investors, a narrower bid-ask spread means a lower cost of entering or exiting a position in this gilt, which generally indicates improved liquidity and more efficient pricing. The data shows only the timing and size of the change. It does not identify its cause, and a single month of observations is not sufficient to determine whether the lower spread will persist.

The bid-ask spread of the 0¾% Index-linked Treasury Gilt 2034 (TRTQ) moved on a downward trend over the past month, based on a fitted trend coefficient of approximately -0.073 with a threshold of 0.032. The spread was broadly stable at around 1.60% through 21 October 2026, ranging from roughly 1.59% to 1.62% in the preceding weeks.

The decline is best understood as a sharp step change rather than a gradual compression. On 22 October 2026, the spread fell to 0.289%, a drop of roughly 1.32 percentage points, or about 82% from the prior session's 1.6079%. The spread has since remained close to this level, between 0.2787% and 0.2888%, through 30 October 2026. The linear trend is therefore largely driven by this single abrupt shift and the subsequent stability at the lower level.

For investors, a narrower bid-ask spread indicates that the implicit cost of trading TRTQ, measured as the gap between buying and selling prices, has fallen substantially. Lower spreads generally reflect more favourable trading conditions for this inflation-linked gilt, reducing the round-trip cost faced by market participants. The data alone does not identify the underlying cause of the change, and no conclusions about future spread behaviour can be drawn from this observation.

The bid-ask spread on the T2IL, the 2% Index-linked Treasury Stock 2035, has followed a downward trend over the past month, falling from 0.7498% on 30 September 2026 to 0.3048% on 30 October 2026, a decline of roughly 0.445 percentage points or about 59%. The bid-ask spread is the gap between the price at which dealers will buy a bond and the price at which they will sell it, so a narrower spread means a lower cost of trading the bond.

The movement was not gradual. The spread held in a narrow range of about 0.74% to 0.75% through 21 October 2026, then dropped sharply to 0.3023% on 22 October 2026. It has remained between roughly 0.30% and 0.31% since then, with the past day showing a marginal increase from 0.3012% to 0.3048%. The downward trend in the data therefore reflects a single step change rather than a steady tightening over the period.

The implication is that the T2IL has become considerably cheaper to trade on a bid-ask basis than it was before 22 October 2026. Investors executing transactions in this index-linked gilt would face lower implicit costs, and the level has been stable since the change. The data does not indicate the cause of the step change, so the drivers cannot be determined from this analysis alone.

TS34, the 4¼% Treasury Gilt 2034 (maturing 31 July 2034), shows a clear downward trend in its bid-ask spread over the past month. The spread narrowed from 0.4267% on 30 September 2026 to 0.2012% on 30 October 2026, a fall of roughly 0.23 percentage points or about 53%.

The decline was not gradual. Through 21 October the spread held in a tight range of about 0.425% to 0.429%. On 22 October it dropped sharply to 0.2022%, and it has since stayed near 0.19% to 0.20%. The average over the seven trading days since the break is about 0.196%, compared with about 0.427% before it. The step change points to a discrete shift in quoting conditions rather than a steady improvement in liquidity. The data does not identify the cause.

A narrower bid-ask spread means a lower implicit cost for buying and selling the bond. For investors, the implication is that a round-trip trade in TS34 now costs roughly half as much in spread terms as it did a month ago. The bond has about 7.75 years to maturity, so this change in trading cost applies to a medium-dated conventional gilt. Whether the lower spread persists will show in future observations.

The bid-ask spread on the 0⅛% Index-linked Treasury Gilt 2050 (TR50)... Let me correct the bond name: TR50 is the 0½% Index-linked Treasury Gilt 2050, maturing 22 March 2050. Its bid-ask spread followed a downward trend over the past month, falling from 2.23% on 30 September 2026 to 0.85% on 30 October 2026, a decline of roughly 1.4 percentage points, or about 62%.

For most of the period, the spread moved within a range of roughly 2.0% to 2.4%. It then dropped sharply on 22 October 2026, from 2.07% to 0.86%, and has since remained in a narrow band of about 0.85% to 0.87%. This suggests a discrete change rather than a gradual tightening. Over the past day, the spread edged down marginally, from 0.8522% to 0.8515%. The fitted trend coefficient of -0.077 exceeds the reported threshold of 0.045 in magnitude, confirming the downward direction of the trend.

A narrower bid-ask spread implies lower implicit transaction costs for investors trading this bond, which points to improved liquidity or tighter quoted prices in the market. The data do not identify the cause of the abrupt shift in late October, so further information would be needed to attribute it.

The bid-ask spread on the TR56 index-linked gilt (0 1/8% Index-linked Treasury Gilt 2056, maturing 22 November 2056) has followed a clear downward trend over the past month, falling from 2.42% on 30 September 2026 to 1.16% on 30 October 2026. This is a reduction of roughly 1.3 percentage points, or about 52%.

For most of the period, the spread moved within a band of approximately 2.0% to 2.7%. The decline was not gradual. On 22 October, the spread dropped abruptly from 2.30% to 1.15%, and it has since remained in a narrow range of roughly 1.14% to 1.17%. The fitted trend coefficient of -0.068 is negative and its magnitude exceeds the stated threshold of 0.048, which supports the downward classification.

A narrower bid-ask spread means the gap between the prices at which buyers and sellers are willing to transact has contracted. This generally indicates tighter pricing and lower implicit transaction costs for investors trading this inflation-linked gilt. The abrupt step change followed by stability is consistent with a discrete shift in quoting conditions rather than a gradual adjustment. The data does not identify the cause of this shift, and whether the post-22 October level persists remains to be seen.

Over the past month, the bid-ask spread of the 4¼% Treasury Stock 2036 (T4Q, ISIN GB0032452392) has been on a downward trend, with a fitted linear coefficient of -0.0116 that exceeds the 0.0087 threshold used to classify the movement as a trend. The spread held in a narrow range of roughly 0.43% to 0.44% from 30 September through 21 October 2026.

The decline is best described as a structural break rather than a gradual compression. On 22 October 2026 the spread fell from 0.4338% to 0.2167%, a reduction of about 50%. It then stabilised between 0.2268% and 0.2275% for the rest of the period. By 30 October the spread stood at 0.2264%, roughly 48% below its level at the start of the lookback window. Over the past day, the change was marginal, at a decline of about 0.0005 percentage points.

A narrower bid-ask spread indicates that the cost of executing a round-trip trade in this bond has fallen, which typically points to tighter quoted prices and improved market liquidity for this specific gilt. The data does not identify the cause of the abrupt step change, so the underlying driver cannot be determined from this information alone. Investors monitoring execution costs for this bond should note that the lower spread has persisted for about a week since the break.

The bid-ask spread of the 1¾% Index-linked Treasury Gilt 2038 (T38) has followed a downward trend over the past month, falling from approximately 1.05% on 30 September 2026 to 0.42% on 30 October 2026. The trend coefficient of -0.034 is larger in absolute terms than the stated threshold of 0.021, so the decline is material by the knowledge base's own criteria.

Most of the move occurred in a single step. The spread stood at 1.06% on 21 October 2026 and dropped to 0.43% on 22 October 2026, a fall of roughly 60% in one session. Since then the series has held in a narrow band of about 0.42% to 0.43%, which indicates that the lower spread level has persisted rather than reversed.

A narrower bid-ask spread means the cost of trading T38 immediately, relative to its mid-price, has fallen. This generally points to improved liquidity and tighter two-way pricing for this index-linked gilt, and it lowers the round-trip transaction cost for investors entering or exiting positions. The data does not identify the cause of the step change, so this analysis describes observed pricing conditions and does not forecast future spread behaviour.

The bid-ask spread of the TG50 (0 5/8% Treasury Gilt 2050) followed a clear downward trend over the past month, narrowing from about 1.54% on 30 September 2026 to 0.79% on 30 October 2026. The fitted trend coefficient of -0.042 exceeds the stated threshold of 0.031 in magnitude, which is why the series is classified as a downward trend.

Most of the narrowing occurred in a single step. Between 21 and 22 October, the spread fell from 1.497% to 0.8037%, a drop of roughly 46% in one day. Before this break, the spread had drifted gently lower from around 1.55% in early October. Since 22 October it has been stable, moving within a narrow band of roughly 0.79% to 0.80%. The break coincides with 22 October, which is the bond's maturity anniversary date and a coupon date, but the data alone does not establish a cause.

A bid-ask spread is a proxy for the cost of immediate execution and for market liquidity. A spread that roughly halves indicates that quoted prices on TG50 have tightened materially, so the cost of trading this bond is now considerably lower than at the start of the month. The level has held steady since the step change, suggesting the new pricing has persisted rather than reverted over the observed period.

The 1 1/8% Treasury Gilt 2073 (TR73), a conventional gilt maturing on 22 October 2073, shows a clear downward trend in its bid-ask spread over the past month. The spread narrowed from 1.81% on 30 September 2026 to 0.99% on 30 October 2026, a decline of about 0.82 percentage points, or roughly 45%. The fitted linear trend has a slope of approximately -0.043 percentage points per observation, steeper than the 0.036 threshold, which confirms the downward direction.

The decline was not gradual. The spread fluctuated between 1.67% and 1.81% through 21 October 2026, then fell sharply to 1.00% on 22 October, a single-session drop of about 0.74 points (roughly 42%). Since then it has remained in a tight range of 0.96% to 1.00%. The overall trend is therefore driven largely by one step change rather than a steady tightening.

A narrower bid-ask spread indicates lower trading costs and tighter pricing between buyers and sellers, which generally points to improved liquidity for this bond. Because the spread has held near 1% for about a week, the lower level appears to be persisting rather than reflecting a one-off fluctuation. However, the data covers only one month, so it does not establish a longer-term pattern. Investors trading TR73 may currently face lower execution costs than in the preceding weeks.

The bid-ask spread of the 0 1/8% Index-linked Treasury Gilt 2039 (TG39, ISIN GB00BLH38265) has followed a downward trend over the past month, falling from 1.958% on 30 September 2026 to 0.488% on 30 October 2026. That is a decline of roughly 1.47 percentage points, or about 75%.

The move was not gradual. The spread held in a narrow range of about 1.94% to 1.97% through 21 October 2026, then dropped to 0.4781% on 22 October 2026. It has since stayed between roughly 0.47% and 0.49%. The downward trend is therefore driven largely by this single step change rather than a steady tightening across the month. Over the past day, the spread edged down by 0.0012 percentage points, from 0.4892% to 0.488%, which is essentially flat.

A narrower bid-ask spread indicates lower implicit transaction costs and a smaller gap between dealer bid and offer prices, which typically points to improved liquidity or reduced dealer risk premia for this bond. The abrupt nature of the change suggests a discrete event or a shift in market structure around 22 October 2026, although the data alone does not identify its cause. Investors trading TG39 would now face materially lower trading costs than during the prior month, and the stability of the spread since late October indicates the new level has held so far.

The bid-ask spread of the T29 bond, the 0 1/8% Index-linked Treasury Gilt maturing on 22 March 2029, followed a downward trend over the past month. The fitted trend coefficient of -0.052 exceeds its threshold, confirming the decline is statistically meaningful.

For most of the period, the spread was stable at roughly 1.02%, ranging between 1.0165% and 1.0195%. The only notable deviation before the final week was a single-day dip to 0.9778% on 15 October 2026, which reversed to 1.0171% the following session. The decisive change occurred on 22 October 2026, when the spread fell abruptly to 0.0713%, a reduction of about 0.95 percentage points. It remained near 0.071% through 30 October 2026.

Because the trend is driven almost entirely by this single step change rather than gradual tightening, it reflects a discrete shift rather than a progressive improvement. A spread at this level indicates that the immediate cost of trading the bond has fallen substantially, which generally points to better liquidity and lower transaction costs for investors. The data does not identify the cause of the shift. Investors should therefore verify whether it reflects changed market-making conditions or a change in how quotes are recorded before relying on the new level.

The bid-ask spread on the 1 5/8% Treasury Gilt 2054 (TR54, ISIN GB00BJLR0J16) followed a clear downward trend over the past month, falling from 1.19% on 30 September 2026 to 0.74% on 30 October 2026. This is a decline of roughly 38%, and the fitted trend coefficient of about -0.025 per observation exceeds its threshold, which indicates the move is statistically meaningful rather than noise.

The decline was not gradual. The spread drifted between 1.12% and 1.22% for most of October, then dropped sharply from 1.14% on 20 October to 1.03% on 21 October and to 0.72% on 22 October. Since that step change, the spread has held in a narrow band of roughly 0.72% to 0.75%, suggesting the market has settled at a new, lower level.

A narrower bid-ask spread means the difference between the price buyers are willing to pay and the price sellers are willing to accept has tightened. For a long-dated conventional gilt, this is typically associated with improved liquidity and lower implicit transaction costs for investors. The data alone does not identify the cause of the abrupt shift around 22 October, so any attribution would require additional information on market events or changes in trading conditions.

The bid-ask spread on the 0 1/8% Index-linked Treasury Gilt 2044 (T44, ISIN GB00B7RN0G65), an inflation-linked gilt maturing on 22 March 2044, has followed a downward trend over the past month. The spread stood at about 2.26% at the end of September 2026 and fluctuated between roughly 2.19% and 2.29% through 21 October. It then fell abruptly to 0.6826% on 22 October, a drop of approximately 1.55 percentage points in a single session, and has since remained within a narrow band of 0.675% to 0.682%.

The fitted linear trend carries a negative coefficient of -0.088, confirming the downward direction over the lookback window. However, the decline is driven almost entirely by the single step change on 22 October, so the linear fit is heavily influenced by that one observation. The spread has been broadly flat in the subsequent week.

The implication is that the gap between dealer buy and sell prices has narrowed by roughly 70%, which lowers the implicit transaction cost of trading this linker and points to improved liquidity or tighter quoting conditions. The data do not identify the cause of the break, so further information would be needed to assess whether the lower spread level persists.

The bid-ask spread of the 0 1/2% Treasury Gilt 2061 (TG61, maturing 22 October 2061) has followed a clear downward trend over the past month. The spread narrowed from 2.239% on 30 September 2026 to 1.065% on 30 October 2026, a decline of roughly 52%. The fitted trend coefficient is negative, which confirms the direction of the move.

Most of the decline came in a single step. Between 21 October (2.0026%) and 22 October (1.0394%), the spread roughly halved, and it has remained close to 1.07% since then. Before that step, the spread had moved within a relatively stable band of about 1.9% to 2.3%.

A narrower bid-ask spread means the difference between the prices at which dealers will buy and sell the bond has shrunk. This indicates lower transaction costs and better pricing efficiency for investors trading this line. Because the move is concentrated in one date and the spread has been stable at the lower level since, the data point to a persistent change in the bond's trading conditions rather than a short-lived fluctuation. The data does not identify the cause of the change.

The bid-ask spread on the 4 1/8% Treasury Gilt 2029 (TS29) has followed a downward trend over the past month, falling from approximately 0.306% to around 0.07%. This decline is best understood as a discrete step rather than a gradual tightening. The spread held in a narrow range of about 0.305% to 0.306% through 21 October 2026, then dropped to 0.0714% on 22 October 2026.

Since that step, the spread has alternated between roughly 0.071% and 0.082% on consecutive days, indicating a stable new range rather than a continued decline. The fitted trend coefficient of -0.0127 is therefore driven largely by this single change and should not be read as evidence of steady narrowing throughout the period.

A bid-ask spread represents the implicit cost of trading a bond, the difference between the price at which dealers will buy and sell. The reduction of roughly three quarters means the cost of immediately buying and selling TS29 has fallen substantially, which points to improved liquidity or tighter quoting for this line. The data alone does not identify the cause of the shift, so further information would be needed before drawing firm conclusions. For investors trading TS29, execution costs are currently considerably lower than they were a month ago.

The bid-ask spread on the TR37 (1⅛% Index-linked Treasury Gilt 2037, ISIN GB00B1L6W962, maturing 22 November 2037) shows a downward trend over the past month. The spread narrowed from 1.66% on 30 September 2026 to 0.42% on 30 October 2026, a decline of roughly 75%.

The move is best described as an abrupt level shift rather than a gradual decline. From 30 September to 21 October 2026, the spread fluctuated within a narrow band of about 1.65% to 1.67%. On 22 October 2026 it fell to 0.41%, and it has since stayed within a tight range of roughly 0.41% to 0.42%. The trend coefficient of -0.069 is larger in magnitude than the 0.033 threshold, which confirms that the downward trend is statistically meaningful.

A bid-ask spread measures the difference between the prices at which dealers will buy and sell a bond, so it is a direct indicator of trading cost and market liquidity. A spread that has fallen to a quarter of its previous level implies that investors trading TR37 now face a substantially smaller transaction cost than before. The data does not identify the cause of the change, so it should be verified whether it reflects a shift in market-making conditions, quoting practices, or a data-source change before it is treated as a lasting improvement in liquidity.

The bid-ask spread on the TR35 (1 1/8% Index-linked Treasury Gilt 2035) has followed a clear downward trend over the past month, falling from 1.1003% on 2026-09-30 to 0.339% on 2026-10-30, a decline of roughly 0.76 percentage points or about 69%. The regression slope is negative and its magnitude exceeds the stated threshold, so the decline is statistically meaningful rather than noise.

Most of the move occurred in a single step. Between 2026-10-21 and 2026-10-22, the spread dropped from 1.0336% to 0.3404%, a fall of about 67% in one session. Since then, the spread has stayed in a narrow range of roughly 0.33% to 0.34%. Over the past day, it edged up from 0.3291% to 0.339%, a small rise of about 0.01 percentage points.

A narrower bid-ask spread means the gap between the price at which dealers will buy and sell the bond is smaller, which implies lower implicit transaction costs for investors and a more liquid market for this security. The sustained level since the October 22 drop suggests the improvement has persisted rather than being a one-off reading, although the data alone does not identify the underlying cause of the shift.

The bid-ask spread on the 0 5/8% Index-linked Treasury Gilt 2040 (TR40) followed a downward trend over the past month, falling from 1.87% on 30 September 2026 to 0.50% on 30 October 2026. That is a reduction of about 1.37 percentage points, or roughly 73%. The trend coefficient of -0.076 per observation exceeds the 0.037 threshold, indicating that the decline is material rather than noise.

The move was not gradual. Through 21 October, the spread moved within a narrow band of about 1.85% to 1.88%. It then dropped sharply to 0.505% on 22 October and has since remained between roughly 0.50% and 0.52%. Since the spread has been stable at this lower level since the step change, the downward trend reflects a single abrupt shift rather than a continuing narrowing.

A tighter bid-ask spread generally indicates lower transaction costs and better liquidity in the secondary market, allowing investors to trade closer to mid-market prices. The data shows a sharp and persistent improvement in quoted liquidity for this inflation-linked gilt, which matures on 22 March 2040. The knowledge base does not identify the cause of the shift.

The 4 5/8% Green Gilt 2037 (T37H, ISIN GB00BVP99905), which was issued on 2026-03-11 and matures on 2037-03-07, shows a clear downward trend in its bid-ask spread over the past month. The spread narrowed from about 0.43% on 2026-09-30 to about 0.24% on 2026-10-30, a decline of roughly 0.18 percentage points, or around 43%.

Most of the move was a single step change. The spread held in a tight range of roughly 0.43% to 0.43% through 2026-10-21, then fell to 0.2343% on 2026-10-22 and has stayed near 0.24% since. The fitted linear trend coefficient is approximately -0.0102 per period, and its magnitude exceeds the defined threshold, which is why the trend was flagged.

A narrower bid-ask spread means the gap between dealer buy and sell quotes has tightened, which is generally associated with lower transaction costs and better market liquidity for the bond. Because the decline is concentrated around a single date, it is a discrete change in quoted liquidity rather than a gradual drift. The data alone does not identify the cause of this shift.

The index-linked gilt T41 (0 1/8% Index-linked Treasury Gilt 2041, ISIN GB00BGDYHF49) shows a downward trend in its bid-ask spread over the past month, with a linear coefficient of -0.031 against a threshold of 0.024. The spread started the period at around 1.15%, moved between roughly 0.98% and 1.18% through 21 October, and closed at approximately 0.58% on 30 October.

The most pronounced move occurred on 22 October, when the spread fell from 1.1543% to 0.5753%, roughly halving in a single session. Since then the series has been stable, fluctuating between about 0.57% and 0.59% over the last six sessions, which indicates the lower level has held rather than reverted. A narrower bid-ask spread generally signals lower transaction costs and tighter dealer pricing for investors trading this bond. The data does not identify the cause of the step change.

The bid-ask spread of the 3¾% Treasury Gilt 2038 (TG38) has followed a downward trend over the past month, falling from 0.4698% on 30 September 2026 to 0.2663% on 30 October 2026, a decline of roughly 43%. The fitted slope of -0.0114 percentage points per observation exceeds the trend threshold of 0.0094 in absolute terms, confirming the direction of the move.

Most of the decline occurred in a single step. For roughly the first three weeks of the period, the spread held in a narrow range around 0.47%. On 22 October 2026 it dropped to 0.2683% from 0.4673% in the prior session, and it has since remained between about 0.256% and 0.267%. Over the past day, the spread edged down marginally from 0.2671% to 0.2663%.

A narrower bid-ask spread means a smaller difference between the prices at which dealers buy and sell the bond, which indicates lower implicit transaction costs for investors trading TG38. The abrupt change on 22 October 2026 is the most significant movement in the series, and the subsequent stability at the lower level indicates that the reduced spread has persisted through the end of the period analysed.

The bid-ask spread of the 0 7/8% Treasury Gilt 2046 (TG46) has followed a downward trend over the past 1 month, falling from approximately 1.18% on 30 September 2026 to 0.66% on 30 October 2026. The fitted linear trend has a slope of about -0.029 percentage points per observation, a magnitude that exceeds the defined threshold of 0.024 and therefore qualifies as a trend.

The decline was not gradual. The spread moved within a range of roughly 1.15% to 1.19% until 21 October 2026, then dropped to 0.64% on 22 October, a single-session fall of about 44%. Since then, it has remained between 0.64% and 0.67%. This pattern points to a step change in the spread's level rather than a steady compression over the period.

A narrower bid-ask spread indicates lower implicit transaction costs for investors trading this bond, as the gap between buying and selling prices has tightened. The stability of the spread at its new level over the last several sessions suggests the lower cost profile has persisted so far. Market participants monitoring execution costs or liquidity for this gilt should note that its trading characteristics have changed materially over the past month.

The bid-ask spread for the TG71 (1 5/8% Treasury Gilt 2071) has been on a downward trend over the past month, falling from 1.412% on 30 September 2026 to 0.8558% on 30 October 2026, a decline of roughly 0.56 percentage points or about 39%. The fall was not gradual. The spread held in a range of roughly 1.33% to 1.42% through 21 October, then dropped to 0.8679% on 22 October, a single-session decline of about 36%.

Since that step change, the spread has remained in a narrow band of approximately 0.856% to 0.868%, and it changed by only about 0.2% over the past day. The lower spread means the gap between the prices at which dealers will buy and sell the bond has narrowed considerably, which reduces the implicit transaction cost for investors trading this gilt. The data show that the reduction has been sustained rather than reversed, but they do not identify the cause of the shift.

The bid-ask spread on the 1¼% Treasury Gilt 2027 (TG27) has followed a downward trend over the past month, falling from 0.2051% on 30 September 2026 to 0.0204% on 30 October 2026, a decline of roughly 90%. The downward trend is statistically meaningful, with a trend coefficient of -0.0101 that exceeds the 0.0041 threshold.

The decline was a sudden step change rather than a gradual erosion. From 1 October to 21 October 2026, the spread moved only marginally, from 0.2049% to 0.2047%. It then dropped to 0.0205% on 22 October 2026 and has remained near that level since. The one exception was a single-day spike to 0.0307% on 27 October, which reversed the following session.

The bond's static data identify it as a conventional gilt with a 1.25% coupon maturing on 22 July 2027, so it is a short-dated instrument with roughly nine months to maturity at the end of the observation window. A spread of about 0.02% is a tenth of its level one month earlier, which indicates considerably lower dealing costs for investors trading this bond and tighter pricing between buyer and seller quotes. The data do not identify the cause of the shift, so the observed change should be read as a descriptive fact about the bond's quoted liquidity.

The bid-ask spread of the T47 (0¾% Index-linked Treasury Gilt 2047, ISIN GB00B24FFM16) has followed a clear downward trend over the past 1 month, falling from about 1.95% on 30 September 2026 to 0.755% on 30 October 2026. Through 21 October the spread mostly fluctuated between roughly 1.5% and 2.1%, with no sustained direction.

The decline was abrupt rather than gradual. On 22 October the spread dropped from 1.8491% to 0.7625%, a fall of about 1.1 percentage points, or roughly 59%, in a single session. Since then the spread has been very stable, trading in a narrow band between 0.7554% and 0.7611%, which indicates that the lower level has been sustained rather than reversed.

A narrower bid-ask spread means the difference between the prices at which dealers will buy and sell the bond has shrunk, which generally implies lower transaction costs for investors and more efficient pricing for this inflation-linked gilt. The data show the timing and magnitude of the change but do not identify its cause, so any explanation would require further information.

The bid-ask spread of the 4½% Treasury Gilt 2034 (TR34, ISIN GB00B52WS153) has followed a downward trend over the past 1 month, with a fitted coefficient of approximately -0.0123 per observation, which exceeds the stated threshold in magnitude. The spread fell from around 0.42% at the end of September 2026 to 0.187% on 30 October 2026, a decline of roughly 55%.

Most of this decline occurred in a single step on 22 October 2026, when the spread dropped from 0.4185% to 0.1987%. Before that date it had remained within a narrow band of about 0.417% to 0.421%. Since the step, the spread has held near 0.198% to 0.199% before dipping to 0.1873% on 30 October. The persistence of the lower level, rather than a single-day reversal, suggests a sustained change in quoted trading costs for this bond. The data does not identify the cause of the shift.

A narrower bid-ask spread means that the difference between the prices at which dealers buy and sell the bond is smaller relative to its price. For investors, this implies lower implicit transaction costs for immediate execution in TR34 at current levels, and points to tighter quoted liquidity for this issue over the period analysed.

The bid-ask spread on the 4⅜% Treasury Gilt 2028 (TE28, ISIN GB00BSQNRC93) has followed a downward trend over the past month. From 30 September to 21 October 2026, the spread was stable at approximately 0.20%, moving within a narrow band of 0.2007% to 0.2010%. On 22 October it fell abruptly to 0.0301%, and it has since remained between 0.03% and 0.04%, closing at 0.0402% on 30 October.

The fitted linear trend has a negative slope of about -0.009 percentage points per day, which exceeds the stated threshold of 0.004. This trend is driven almost entirely by a single step change on 22 October rather than a gradual decline. The spread has since been broadly flat at its new, lower level. Relative to the pre-22 October level, the spread is roughly 80% narrower.

For investors, a narrower bid-ask spread means a lower implicit cost of trading TE28, since the gap between the prices at which the bond can be bought and sold has contracted substantially. The data show a marked improvement in the bond's trading costs over the period, but the knowledge base does not identify the cause of the shift, so the underlying drivers cannot be determined from this data alone.

The bid-ask spread of the 4% Treasury Gilt 2029 (T29K, maturing 22 May 2029) has followed a downward trend over the past month, falling from approximately 0.307% on 30 September 2026 to 0.0715% on 30 October 2026, a decline of roughly 77%. The regression coefficient of -0.0129, which exceeds the 0.0061 threshold in magnitude, indicates that this downward movement is statistically meaningful rather than noise.

The decline was not gradual. The spread held steady at around 0.306% to 0.307% through 21 October 2026, then dropped sharply to 0.0716% on 22 October 2026 and has remained close to that level since. Over the past day, the spread was essentially unchanged, moving from 0.0716% to 0.0715%. A single one-day spike to 0.0818% on 27 October reverted the following session.

A narrower bid-ask spread means the cost of buying and immediately selling the bond has fallen considerably, which points to improved trading liquidity and lower transaction costs for market participants in this gilt. The abrupt, level-based nature of the change suggests a shift in quoting conditions rather than a gradual change in trading activity, although the data alone does not identify the underlying cause.

The bid-ask spread on the TG52 0 1/4% Index-linked Treasury Gilt 2052 has followed a downward trend over the past month, falling from 2.37% on 30 September 2026 to 0.9629% on 30 October 2026, a decline of roughly 1.4 percentage points (about 59%).

The decline was not gradual. Through 21 October the spread fluctuated between about 2.3% and 2.6%. On 22 October it dropped sharply to 0.9576%, a single-day fall of about 1.57 percentage points. Since then the spread has held in a narrow band of roughly 0.95% to 0.97%, with a day-on-day change of only about 0.001 percentage points on 30 October. The regression slope of -0.084 reflects this one-off step change rather than a steady erosion over the period.

The implication is that TG52 has become materially cheaper to trade in bid-ask terms since 22 October, with the spread now at less than half its level in the preceding weeks. Because the data does not show what triggered the shift, its cause cannot be determined from this insight alone.

The 4 3/8% Treasury Gilt 2030 (T30, maturing 7 March 2030) showed a downward trend in its bid-ask spread over the past month. The trend coefficient of -0.0117 exceeds its threshold of 0.0061 in magnitude, indicating a statistically meaningful decline. From 30 September to 21 October 2026, the spread was largely stable, fluctuating narrowly between about 0.305% and 0.306%.

The decline was a step change rather than a gradual compression. On 22 October 2026, the spread fell to 0.0917%, and it has since remained in a tight range of roughly 0.09% to 0.10%, closing at 0.0915% on 30 October 2026. This represents a reduction of about 70% from the prior level.

A narrower bid-ask spread implies a lower cost of executing a round-trip trade in this bond, pointing to improved liquidity and pricing efficiency compared with the earlier period. Because the change occurred within a single session and the dataset does not identify its cause, the analysis cannot attribute it to a specific market event. Market participants should treat the new spread level as the current reference for execution costs while confirming whether it persists across subsequent sessions.

The bid-ask spread of the 0 1/8% Index-linked Treasury Gilt 2028 (T28) has followed a downward trend over the past month, falling from 1.0037% on 30 September 2026 to 0.0501% on 30 October 2026. This is a reduction of roughly 95% in the quoted spread over the period.

The decline was not gradual. The spread stayed in a narrow range of about 0.98% to 1.00% from the start of October until 21 October, with a one-day dip to 0.9829% on 15 October that reversed the next session. On 22 October 2026 the spread dropped sharply to 0.0501%, and it has held between 0.0501% and 0.0502% in every observation since. The downward trend is therefore driven mainly by this single step change rather than a steady narrowing across the month.

Because the spread has remained flat at its new level, the change reflects a lasting shift in quoted trading costs for T28 rather than a short-lived fluctuation. A narrower bid-ask spread means a smaller difference between the prices at which the bond can be bought and sold, so the lower reading indicates tighter pricing for investors trading the security over this period.

The bid-ask spread on the T31H (4 1/8% Treasury Gilt 2031, maturing 7 March 2031) followed a clear downward trend over the past month. The spread hovered around 0.31% from 30 September through 21 October 2026, then fell sharply to 0.1138% on 22 October. It has remained near 0.11% to 0.12% since, closing at 0.1135% on 30 October, a reduction of roughly 0.20 percentage points or about 63%. The fitted trend coefficient of approximately -0.011 per observation exceeds the detection threshold of 0.006 in magnitude, which is why the move was flagged as a trend.

The move was abrupt rather than gradual. Almost all of the decline occurred in a single session, with no meaningful convergence in the days before it. Since the step change, the spread has shown only small day-to-day fluctuations, suggesting a new, stable trading level rather than a continuing decline.

For investors, a narrower bid-ask spread means lower implicit transaction costs when buying or selling the bond. A spread of about 0.11% is substantially tighter than the level seen earlier in the month, indicating improved pricing efficiency for this issue. The data alone does not identify the cause of the shift, so the analysis is limited to the observed change in trading costs.

The bid-ask spread on the T32 (1¼% Index-linked Treasury Gilt 2032) was on a downward trend over the past month, falling from 1.5142% on 30 September 2026 to 0.1712% on 30 October 2026, a reduction of roughly 89%. The coefficient of the fitted trend (-0.074) exceeds the threshold in magnitude, which is why the series is flagged as a trend.

The decline was not gradual. The spread moved within a narrow band of about 1.51% to 1.52% from 30 September through 21 October, then dropped sharply to 0.1816% on 22 October. It has since remained close to 0.17%, with a brief rise to 0.1815% on 29 October before returning to 0.1712% the following day. The trend is therefore driven mainly by a single step change in mid-to-late October rather than a steady decline across the period.

A narrower bid-ask spread indicates lower trading costs for the difference between buying and selling prices, which generally points to improved liquidity or tighter pricing in this bond. The data alone does not identify the cause of the step change, so the observed improvement should be treated as a fact of the recorded quotes rather than as evidence of a sustained shift in market conditions.

The bid-ask spread on the 1¼% Treasury Gilt 2041 (TG41) has followed a downward trend over the past 1 month, falling from 0.7229% on 30 September 2026 to 0.3875% on 30 October 2026. This is a decline of roughly 0.335 percentage points, or about 46%. The linear trend coefficient of -0.018 exceeds its threshold in magnitude, which is why the movement is classified as a significant downward trend.

Most of the narrowing occurred in a short window. The spread held between about 0.71% and 0.73% until 21 October, then dropped to 0.5167% on 22 October and to 0.3905% on 23 October. It has since stabilised in a range of roughly 0.37% to 0.39%. This pattern indicates a step change in trading costs rather than a gradual drift.

A narrower bid-ask spread means the gap between the prices at which dealers will buy and sell the bond has tightened. For investors, this implies lower implicit transaction costs and improved liquidity in this line compared with the start of the month. The data show the change in quoted spread only and do not identify its cause.

The bid-ask spread of the T27 (1¼% Index-linked Treasury Gilt 2027) shows a downward trend over the past 1 month, with the regression slope at approximately -0.053 percentage points per period. However, the trend is driven by an abrupt structural change rather than a gradual decline. From 30 September to 21 October 2026, the spread held steady in a narrow band of roughly 0.983% to 0.984%. On 22 October 2026 it fell to 0.0393%, and it has since remained between 0.0295% and 0.0393%.

This step change reduced the quoted spread by roughly 0.94 percentage points in a single session, a reduction of about 96%. The post-break readings are highly stable, with a range of less than 0.01 percentage points over the final week. A lower bid-ask spread indicates a smaller cost of immediately trading the bond, which points to tighter pricing and improved liquidity in the quoted market for this linker. The data does not identify the cause of the change, so the observed break should be treated as a fact in the series rather than as evidence of a sustained trend in trading conditions.

The bid-ask spread on the TR38 (4¾% Treasury Stock 2038) has followed a downward trend over the past month, falling from 0.4308% on 30 September 2026 to 0.2761% on 30 October 2026, a decline of roughly 36%.

The movement was not gradual. The spread held in a narrow range of about 0.42% to 0.43% through 21 October, then dropped sharply to 0.2674% on 22 October, a single-day fall of roughly 38%. This step change marks the start of the lower regime, which has persisted since.

From 22 October to 29 October the spread remained tightly clustered between 0.2662% and 0.2674%, indicating limited day-to-day variation in trading costs. On 30 October it rose to 0.2761%, an increase of about 4% from the previous session, though it remains well below its level before 22 October.

A bid-ask spread measures the gap between the price at which dealers will buy and sell a bond, so a narrower spread indicates lower transaction costs and more favourable liquidity conditions for this security. The sustained reduction over the period suggests improved liquidity in the TR38 relative to its earlier trading levels, based solely on the data provided.

The bid-ask spread of the 0 7/8% Treasury Gilt 2029 (TR29, ISIN GB00BJMHB534) has been on a downward trend over the past month, narrowing from approximately 0.337% to about 0.09%, a decline of roughly 73%.

The spread held steady at around 0.337% through the first three weeks of the period, with daily readings between 0.3365% and 0.3375%. The decline was abrupt rather than gradual. On 2026-10-22 the spread fell to 0.0786%, and it has since remained in a narrow range of 0.0785% to 0.0899%, closing at 0.0896% on 2026-10-30. The fitted trend coefficient of -0.0138 exceeds the associated threshold, which confirms the downward direction.

The lower spread means the cost of transacting in this bond, as measured by the difference between bid and ask quotes, has fallen substantially compared with the preceding weeks. Because the movement is a single step change followed by a stable level, the trend reflects a shift in quoted spreads at one point in time rather than a sustained erosion over the month. The data does not identify the cause of the change.

The bid-ask spread of the TG37 gilt (1¾% Treasury Gilt 2037) has followed a downward trend over the past month, falling from 0.5752% on 2026-09-30 to 0.2829% on 2026-10-30. This is a decline of roughly 0.29 percentage points, or about 51%. The fitted trend coefficient of -0.0161 is well beyond its threshold of 0.0115, which confirms that the decline is statistically significant rather than day-to-day noise.

The movement is not gradual. The spread held in a narrow band of about 0.57% from 30 September through 21 October, then dropped to 0.2852% on 22 October and has remained near that level since. Over the past day, it eased slightly from 0.2838% to 0.2829%. Because the break occurs in a single session rather than through steady convergence, it points to a discrete change in the market, such as a shift in quoting conditions or liquidity provision, rather than a gradual change in trading activity. The data alone cannot identify the cause.

The practical implication is that the cost of immediately buying and selling TG37 has roughly halved. A narrower spread generally indicates better liquidity and lower transaction costs for investors and dealers trading this bond. Since the spread has stabilised at the lower level in the days following the break, the new level appears to be persisting in the data.

The bid-ask spread on the 4¾% Treasury Gilt 2030 (TR30, maturing 7 December 2030) has followed a downward trend over the past month. The fitted slope of -0.0105 is steeper in absolute terms than the 0.0060 threshold. For most of the period, the spread was stable at around 0.30%, ranging from 0.3005% to 0.3019% between 30 September and 21 October 2026.

On 22 October 2026, the spread fell sharply to 0.1106%, a decline of roughly 63% from the prior session's 0.3016%. It has since remained in a tight range of 0.1104% to 0.1107% through 30 October 2026, with a change of only -0.0002 percentage points over the past day. The downward trend is therefore driven almost entirely by a single step change rather than a gradual decline.

The bid-ask spread measures the cost of trading and the depth of liquidity in a bond. The data shows that trading costs for this gilt fell markedly and then held at a new, lower level. The dataset does not identify the cause of the shift, and the persistence of the lower spread over the subsequent sessions is the key observation from this period.