Been signed up at Single Bet Calculator since around February, mostly late at night on the sofa, so make of that what you will. Found it through a Reddit thread, nobody paid me.
The lobby is pretty big — somewhere north of 3,000 slots according to the filter counts. Play'n GO stuff dominates, so Book of Dead and all the standards are all there. Personally I mainly play Big Time Gaming megaways out of pure habit. One gripe — the search function on Single Bet Calculator is a bit rubbish, I usually just scroll and hope.
Live tables are powered by Evolution, no complaints there. Real croupiers, decent stream quality, and Crazy Time and Lightning Roulette pulls a big crowd most evenings. Fair to note the British tables are properly staffed from about 6pm onwards. If you want to compare the current terms it's worth a look at single calculator bet rather than taking my word for it.
Bonus-wise from Single Bet Calculator came as 100% up to ?200 plus 100 free spins. Wagering is 35x which is about par these days. They also ran 20 no deposit spins when I registered. Min deposit is ?10, registration was quick, ID check was same-day.
Payouts are decent. Card payments take 2-3 days, Skrill were same-day for me, and crypto clears fastest. Pulled ?180 out on Tuesday with no drama. The live chat on Single Bet Calculator was on me within five minutes — copy-paste at first but fine after. They're UKGC licensed, so at least there's a complaints route. App-wise there's nothing, just the mobile site.