Here in the UK, I don’t generally tip. Partly because they get paid a more reasonable wage than other parts of the world, but mostly because most places just add 10% to 12.5% on the bill at the end as a “discretionary” service charge, and it’s only removed if there’s service bad enough to cause a complaint.
Honestly though, I’d rather it this way that to pretend tips are optional - I see the number at the bottom, I pay the number, all is right with the world.