Chapter 1 of Part 2 of the Levelling-up and Regeneration Act 2023 (c. 55) (“the 2023 Act”) provides for the establishment of combined county authorities (“CCAs”) for areas consisting of the whole area of a two-tier county council, plus a minimum of one or more whole areas of another two-tier county council, unitary county council or unitary district council in England. CCAs are bodies corporate which may be given power to exercise specified functions of a local authority under section 18 of the 2023 Act, and of a public authority under section 19 of that Act.