Hi,
Although you will be taxable in the country that your home is located, if you are resident in the UK at the time of completion of the disposal, then you may be subject to Capital Gains Tax in the UK.
To calculate if there is a gain, you will need to convert the acquisition costs using a just and reasonable exchange rate in use at the time of aquisition. You will also need to do this for the disposal value.
If the property was you main residence, you may be able to claim Private Residence Relief to reduce any potential capital gain. You can see guidance here:
HS283 Private Residence Relief (2023)
There is also a calulator to help:
Tax when you sell property
Any Capital Gains Tax payable will need to be declared in a Self Assessment tax return. You can see guidance for Self Assessment here:
Self Assessment
Thank you.