Public Expenditure
2026-07-13 · Treasury · HL1947 · Official question
Question
To ask His Majesty's Government what changes they have made to the HM Treasury Green Book in the last two years; and what was the purpose of each change.
Answer
HM Treasury concluded its review of the Green Book in June 2025. Since then, it has published a clearer, shorter Green Book, ensuring decisions are no longer based solely on single metrics such as benefit-cost ratios (BCRs), but instead consider the full ...