I find that finding a casino in the UK without a gamestop is really difficult. You have to analyse different sites, search for information, read different articles. I wanted to find the perfect list of casinos without gamestop too. I managed to find the list non gamstop casinos https://nongamstopcasinos.net/ right on the website. Look how big the selection is for UK residents. And there are also reviews here. Great information you were probably looking for