To ask the Chancellor of the Exchequer, with reference to page 37 of his Department's publication entitled, Spring Budget 2024: Policy Costings, published in March 2024, if he will publish the figures used by his Department for the size of the tax base in calculating those costings.

The policy costing was based on data reflecting business rates receipts and reliefs as reported by local authorities in the National Non-Domestic Rates forms, which are publicly available on the gov.uk website.