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Thanks for clarifying If I use the following sources for exchange rates: Federal Reserve and Bank of England. When trades are done on bank holidays or weekend where data is not available can the next working day be used e.g. Trades done on a Saturday use spot rate from the upcoming Monday?

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I'm trading crypto and stocks using the Alpaca platform (US Trading platform). The entire portfolio will be continuously reinvested so all profits are retained in the account. My understanding is: Maintain a record of all buy/sell transations including the exchange rate at point of sale (or as close to the date as possible) File a self assement tax return at the end of the tax year If the value exceeds 6k it is subject to CGT at a rate of 10% for basic and 20% for higher earners Is the above correct and are there any other considerations to be made? e.g. what is the tolerance on exchange rate used etc