All forms of online gambling are licensed by the Gambling Commission and therefore can be legally provided in the country under a licence from the commission. The commission's site has details of both licensed operators and applicants.

Blackjack - Up to 99.87% RTP\n\n This is the highest paying online casino game of them all. Some virtual blackjack variants have a house edge of just 0.13%, meaning there is a 99.87% RTP rate.

Slots are the easiest games to win at, hands down. That's because they require no skill to play  the outcomes are completely random. If you're looking to enjoy relatively frequent wins, low-variance slots are the way to go.