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

https://www.bestbookmarks.win/ukgc-status-is-a-baseline-not-a-promise-check-rtp-info-is-clear-cash-outs

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.