My wife is Italian & we don't normally live in the UK, but when we're visiting, she does enjoy a traditional English Devonshire Tea - so long as she can substitute the pot of tea with a cappuccino.
With this in mind, on a pre-pandemic visit to Harrogate, I took her to Betty's Tea Rooms.
We both had a good time there, so when paying the bill (by cash) I rounded up a bit - slightly over 10%, but not much more - and indicated to the homely, frilly-aproned waitress that I didn't need any change.
"Oh, thank you very much sir", said the waitress. "That's very generous of you!" - in a genuinely pleased, not sarcastic, tone of voice.
After she'd left our table, Mrs S.B leaned over and said "Mamma Mia*, how much did you give her?"
"Only 10%", I replied. "But, you see, we're in Yorkshire now. Probably the only tip she ever gets here is 'look both ways before you cross the road'".
* She didn't really say that, she isn't a stereotype Italian.