I am just wondering what the standard tipping protocol is in the UK. In the US, most people tip 15-20% of the final check at a restaurant/bar (especially, if you want to go there again). I found the tripadvisor guide on tipping in the UK, which says, "Bartenders in pubs and bars do not expect to be tipped."
I assume this is true, but can someone confirm this for me? I've just been brought up to leave a tip and would feel really weird walking out of a bar/restaurant only paying the bill (with no tip).