Hi Jamie Rooney.
You will need to work out if there is tax payable on that disposal, using UK capital gains rules.
There is a capital gains calculator here:
Tax when you sell your home
To help you with this.
All of the values should be declared in pounds sterling, so you will need to convert the Euro to sterling.
Under the terms of Self Assessment, we do not provide an official exchange rate and the onus is on the individual to use a just and reasonable exchange rate for each acquisition and disposal.
For your convenience, there are exchange rates here:
Exchange rates from HMRC in CSV and XML format
You are free to use any of the supplied rates or one of your own choosing.
You will also be able to claim Private Residence Relief for the period that the property was your main residence.
HS283 Private Residence Relief (2024)