Check each site on the UK Gambling Commission register. Read bonus terms...

https://oscar-wiki.win/index.php/What%E2%80%99s_the_difference_between_a_sportsbook_and_a_casino-only_site%3F

Check each site on the UK Gambling Commission register. Read bonus terms closely: don’t assume a 10x wagering cap applies to licensed operators. Test mobile usability and check withdrawal methods and times; headline offers aren’t the whole story.