No, the UK Is Not Going to Make USDC and USDT Legal Tender
None of these payments involve legal tender. Debit cards, credit cards, bank transfers, checks, mobile money, PayPal – not one of these is legal tender in the U.K. In England, only banknotes and coins are legal tender, and low-denomination coins are only legal tender for amounts up to 20 pence (US25 cents). In Scotland, only coins are legal tender.