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

https://paxtonsexpertop-ed.zenbloomer.com/posts/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. Be sceptical of headline bonuses: read the terms, including the 10x wagering cap for licensed operators