Calculating cap gains for HMRC

I am a USC/UKC living in the UK and thinking about what's needed to file with HMRC. In January I sold some US shares and know how much they cost and the exact date they were bought. I also know the exact date and proceeds of the sale and the capital gain in US dollars.

To calculate the cap gains for HMRC I am thinking that I will need to use the exchange rate in effect on the dates of purchase and sale. Does HMRC have a published list of official rates or should I just use the historical rate tables published by a company like XE.com?

Does HMRC have a published list of official rates or should I just use the historical rate tables published by a company like XE.com?

They have their own rate tables.

https://www.gov.uk/government/publications/exchange-rates-for-customs-and-vat-yearly

Excellent, thanks so much for the quick response.

Case law requires that one uses spot rates. HMRC do not publish official spot rates. Any commercially published rate should be acceptable.

Case law requires that one uses spot rates. HMRC do not publish official spot rates. Any commercially published rate should be acceptable.

Perfect, thanks.