Sticky wilds are my pick as well, and
https://needforwincasino.net/ has a good spread of them. UK players seem to like the calmer ones too, judging by what gets mentioned. The bonus rounds are frequent enough to feel worth waiting for. There's a filter for them under the slots tab. That saves hunting. I stick to pennies a spin so it lasts. Twenty minutes on one of those is a proper unwind. And the win lines are simple to follow, no squinting at a paytable. And the payouts feel steady rather than boom and bust. Which is what I want at that hour. Nothing clever, just reliable. Same three titles most weeks. They never get old. Give the low-stake versions a try.