When choosing a UK casino with a solid slot library, look closely at RTP values...

https://thelakewoodscoop.com/news/which-uk-casino-platforms-are-known-for-strong-rtp-slot-libraries/

When choosing a UK casino with a solid slot library, look closely at RTP values since they reflect long-term returns, not short-term wins. Be aware some slots offer different RTP versions depending on the operator