When choosing a UK casino with plenty of high RTP slot options, start by...

https://city-wiki.win/index.php/RTP_vs_Volatility_-_Which_Matters_More_for_a_Short_Session%3F

When choosing a UK casino with plenty of high RTP slot options, start by checking the size of its game library and the software providers featured. Remember, RTP is a theoretical return, not a guarantee