They are both from those countries and completely USA people. Bit baffling really.

Yeah, OP wants to work over a large are, not just where the dents are.

We don’t, we will tip outstanding service for a meal say, usually just a few quid, but it’s slowly becoming more of a thing, like this at some busy bars in cities.

Dunno. I’ve seen this in the UK.

Double JD and coke for the equivalent of 5-6 quid isn’t cheap, but it’s definitely not expensive.