UK online casinos operate under strict rules set by the UK Gambling Commission,...

https://super-wiki.win/index.php/Why_Do_Some_Casinos_Slow_Withdrawals_When_You_Try_to_Cash_Out%3F

UK online casinos operate under strict rules set by the UK Gambling Commission, ensuring fairness and transparency. For example, most games offer a minimum 96% return to player (RTP), and many now support Faster Payments to process withdrawals quickly