TR31

0 1/8% Index-linked Treasury Gilt 2031 · GB00BNNGP551

Dirty price move

+£0.289

21 Jul 2026 → 20 Aug 2026

Start dirty price

£80.031

model £80.031

End dirty price

£80.321

model £80.321

Mark-to-market is the traded price; mark-to-model discounts the remaining flows along the fitted curve. The decomposition below is computed on the model prices.

What moved the price

Effect	Contribution	What it is
Carry	+£0.238	The passage of time at an unchanged yield: the bond simply gets one period closer to redemption.
Rolldown	+£0.036	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£0.014	The move in the curve itself between the two dates.
Unexplained	+£0.030	The residual between the traded prices and what carry, rolldown and variation account for.

The curve, then and now

Market data as of 21 Jul 2026 and 20 Aug 2026.

TR31

What moved the price

The curve, then and now

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