A UKGC licence is the starting point, not a guarantee of a smooth experience....

https://shanesexpertthoughts.capitaljays.com/posts/is-1-200-slots-from-big-studios-better-than-4-000-random-ones

A UKGC licence is the starting point, not a guarantee of a smooth experience. Check whether a site clearly lists slot RTPs, explains how long withdrawals usually take, and offers practical responsible gambling tools such as deposit limits and time-outs