A UKGC licence is the baseline, not a guarantee of a smooth experience. Check...

https://aged-wiki.win/index.php/What_Happens_After_I_Request_a_Withdrawal_on_a_Slot_Site%3F

A UKGC licence is the baseline, not a guarantee of a smooth experience. Check that RTPs are easy to find, withdrawal times are clearly explained, and responsible gambling tools make it simple to set limits or take a break.