Section 191 | Amounts not in sterling
From legislation.gov.uk
(1)If any amount of stake money, gaming payment, winnings or prize is in a currency or method of payment other than sterling, it is to be treated for the purposes of this Part as being the equivalent amount in sterling.
(2)The equivalent amount in sterling, in relation to any day, is to be determined by reference to—
(a)the London closing exchange rate for the previous day, or
(b)if no such rate exists, the rate specified in or determined in accordance with a notice published by the Commissioners.