From my experience, UK players often find that certain branded slots and classic video slots at Mania give the most bang for their bonuses. I’ve personally tried a few and the bonuses lasted longer than expected, letting me explore more games before hitting wagering limits. You can check out the full range and see which slots are highlighted for bonuses here: https://mania-casino.org.uk. It really helps to compare RTPs and bonus contributions if you want to make the most of your UK account.