A UKGC licence is the baseline, not a promise of a good experience. Check if...

https://wool-wiki.win/index.php/How_to_Judge_a_Slot_Site_in_5_Minutes_Before_Depositing

A UKGC licence is the baseline, not a promise of a good experience. Check if RTP is easy to see, cashout times are clear, and funds arrive fast. Good sites also make limits, time-outs and self-exclusion easy to find and use, before play gets out of hand.