The UKGC was/were looking into the Evolution license for them allowing their games (studios under their umbrella) to supply games on non-licensed casinos. That’s more than likely why, and perhaps why you’ll not be able to play other providers, too, as they will all be removing them to avoid issues. I am not sure why this is if you’ve been using a VPN set somewhere else in the past; maybe it’s just the studios being more diligent and restricting their games in other geos before they get hassle from other regulators about the same thing.