Hi Luke,
Please have a look at the help sheet HS283:
HS283 Private Residence Relief (2024).
PRR applies for periods that the property was you main residence.
As you have two or more properties, you have 2 years to nominate which property is your main residence. After this, HMRC will make the decision based on the facts of the case.
CG64485 - Private residence relief: only or main.
There is a calculator at:
Tax when you sell property which will help you work out if a gain arises.
You can then use the links to report and pay the Capital Gains tax.
Thank you.