Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what evidence was used to inform his Department's recent changes to the Green Book methodology; and if he will publish that evidence.

The review of the Green Book was informed by extensive consultation with a wide range of stakeholders, including academics, the National Audit Office, the National Infrastructure Commission, analytical experts and users of the Green Book both in Whitehall and in the Devolved Administrations, the Northern Powerhouse and regional and local government. HM Treasury also reviewed past policy development to understand how appraisal was being applied in practice.

The process and findings of the review are outlined in detail in the Final Report of the 2020 Green Book Review published on the 25^th of November on the Government website.