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

https://www.bookmark-zulu.win/the-difference-is-often-in-the-details-ukgc-status-is-a-baseline-not-a

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.