Originally Posted by
GUWonder
Indeed, it's unlikely to be change.
That said, most of the times when I've gotten Scottish notes, it's been given to me as change in London. But I've gotten Scottish notes back in this way very, very infrequently -- something on the order of less than 1/50.
I've lived in London my whole life (well, with a few gaps here and there) and I don't recall EVER having received a Scottish banknote in change. So I'd say the likelihood isnt anywhere close to 1 in 50, more like in the thousands (if that). Basically negligible.