Simple really even here if I get rubbish service in a restaurant /pub I dont tip simple as. If I CHOOSE to leave a tip it tends to be around the 10% mark & if I go out with work collegues in a big group & get good service the waiting staff love us because their tip is usually very generous.
Good service is rewarded by choice or should be.. not demanded as it seems waiting staff in the US expect.
As for tipping the barman ….. wtf . Might buy em a drink. That’s as far as it goes .. it’s the norm in the UK.
We’re British we don’t make expectations on service users in whatever capacity to tip.
We queue we wait our turn we say please & thank you in the main & if we get rubbish service we complain we are getting better at sending rubbish food back.
Wages here aren’t brillin the service industry in any capacity- though my son (18) works for Mc Donalds part time for his “spends” Knock em all you like Mc Donalds pay very well for his age group.