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

https://www.foxtrot-bookmarks.win/when-choosing-a-uk-casino-with-a-solid-slot-library-pay-close-attention-to-rtp

When choosing a UK casino with a solid slot library, look for clear RTP info since RTP reflects long-term payout averages. Some slots have varying RTP versions depending on the operator