Hi,
As this disposal is of a property overseas, it must be declared in a self assessment tax return.
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 at:-
Exchange rates from HMRC in CSV and XML format
and for older rates at
Foreign exchange rates and spot rates: 1 January 1989 to 31 March 2010.
You are free to use any of the supplied rates or one of your own choosing.
You will have to follow the UK rules for capital gains.
To help with this, you can use the calculator at
Tax when you sell property, to work out the gain to report in your tax return.
Thank you.