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

https://www.yankee-bookmarkings.win/a-good-uk-slot-site-is-clear-not-flashy-ukgc-rules-are-the-baseline-see-rtp

UKGC licensing is the baseline, not a guarantee of a smooth experience. Check if RTP details are easy to find, payouts arrive promptly, and withdrawal checks are clear