Before joining a new betting site, check its licence on the UK Gambling...

https://ricardosinsightfuldigests.huicopper.com/what-should-a-reliable-uk-betting-site-ranking-include-besides-bonuses

Before joining a new betting site, check its licence on the UK Gambling Commission register. Read bonus terms carefully, including the 10x wagering cap for licensed operators, and test mobile usability and withdrawal options