My client has entered a contract with a third-party company to sell a piece of land that they own. This land is currently just a field containing no structures. One of the conditions of the contract for sale is that first they must finish obtaining planning permission for development on the site. When planning permission is granted, completion will occur, and the transaction for £250,000 will be paid.

If planning permission is not obtained, then the contract will be voided.
The contract was signed in June 2024 before the rates of capital gains tax (CGT) were changed on 30 October 2024. What rates of CGT will they have to pay should planning permission be obtained in December 2024?