Heck, I don't think anyone tips in the UK, do they? When I first got to Thailand, nobody tipped. Then the spoil sports arrived (oh, the staff only makes Bt100 a day, boo hoo) and started throwing red bills around. I decide if I get good service, good food and I feel sated; then I'll tip (I'm not a cheapie, but WTF, it's a custom thing). I'm with Marmers on the service/tax added; that's my contribution in the bill, but I rarely ate anywhere that fancy. In Vanc, we have to tip 20% or expect never to see a server near our table.