I probably am BU, but i was mortified.
At the weekend, my DH and I took the children to Legoland Discovery Centre in Manchester, and stayed over the night before. We took a trip to the Trafford Centre, and the children chose McDonald's for dinner. When I paid, I handed over a Bank of Scotland £20 note. The cashier asked if I had any "English money" and, when I told her I didn't, she said she didn't think she could accept Scottish money.
The place was packed, but I asked her to check that with her manager. She then had a shouted conversation with him from one end of the counter to the other, discussing whether my cash was sterling and did it have a metal strip. I was absolutely mortified, and furious.
AIBU to complain on principle?
(I work throughout the UK and have never experienced this before)