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

https://wiki-velo.win/index.php/Why_Do_Some_UK_Casinos_Focus_on_Withdrawal_Speed_Instead_of_Bigger_Bonuses%3F

UK online casinos operate under strict rules set by the UK Gambling Commission, including guidelines on payout percentages and fairness. For example, many games offer a minimum 96% Return to Player (RTP) rate