Check a site's licence on the UK Gambling Commission register. Read bonus...

https://lunasuniqueinsight.inkharbory.com/posts/do-new-betting-sites-cover-tennis-cricket-and-international-competitions

Check a site's licence on the UK Gambling Commission register. Read bonus terms: licensed operators have a 10x wagering cap, but rules still apply. Try the mobile site; check withdrawal speed, fees and limits