Check each site's licence on the UK Gambling Commission register, then read...

https://storyquanta.com/s/_uXd8v1xAsBCmFroWOACS

Check each site's licence on the UK Gambling Commission register, then read bonus terms: licensed operators face a 10x wagering cap. Treat headline offers sceptically, and test mobile usability and withdrawal options, fees and times before signing up.