When choosing a UK casino with a strong slot library, look for clear RTP info...

https://www.start-bookmarks.win/when-choosing-a-uk-casino-with-a-solid-slot-library-and-good-rtp-remember-rtp

When choosing a UK casino with a strong slot library, look for clear RTP info since RTP reflects long-term returns, not short sessions. Some slots offer varying RTP versions depending on the operator