When choosing a UK casino with a strong slot library, check the RTP as it...

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

When choosing a UK casino with a strong slot library, check the RTP as it reflects long-term returns, not short bursts. Be aware that some slots may have different RTP versions depending on the operator