Question to the HM Treasury:

To ask the Chancellor of the Exchequer, if she will update the Green Book to allow for the valuation of the reduced carbon footprint of UK produced materials as opposed to imported ones.

The Green Book has supplementary guidance on the valuation of energy use and greenhouse gas emissions. This is found here: https://assets.publishing.service.gov.uk/media/65aadd020ff90c000f955f17/valuation-of-energy-use-and-greenhouse-gas-emissions-for-appraisal.pdf

That supplementary guidance notes that appraisals should consider the greenhouse gas emissions content of all of the materials that are used to implement a proposal. This applies both to materials produced in the UK, as well as those imported from abroad.