Written Question·Treasury·UIN 102214

Infrastructure: Cost Benefit Analysis

Tabled: 2 January 2026
Answered: 12 January 2026

Question

Callum Anderson

LabourBuckingham and Bletchley

To ask the Chancellor of the Exchequer, what assessment she has made of how changes to the discount rate methodology might affect the appraisal of major infrastructure projects in different UK regions.

Answer

James Murray
The independent review of the Green Book discount rate will be published in the summer 2026. Changes to the Green Book discount rate methodology will affect the appraisal of major infrastructure projects that involve benefits and costs well into the futur...

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