The one time I got to visit England it was with a band touring up and down the main island (started in London, worked our way north to Glasgow/Edinburgh then back down to London again).
Most of the time the bars we played at made sure we had plenty of booze so we weren't having to pay for/order drinks (and we mostly just bought our own and drank in the tour van). Of course we DID go out on our own on off nights or linger at the gigs and I kept getting told you don't tip your bartender. You buy them a drink.
Like you don't have to buy them a drink every time but every few you buy them one.
I thought people were yanking my chain (which seems to be quite the little pub hobby... lol) and being a Canadian it's just completely impolite and disrespectful to not AT LEAST leave 50 cents or so on a beer. So I tipped as I normally would and got weird looks... then tried the "buy them a drink thing" and it was all "Cheers, mayte".
So, my query... what the heck is that all about?