Say you're at the checkout in a store and you receive a torn five-pound note; what's the best way of asking for a different note?
I myself was thinking of something around the lines of "Excuse me; could I have this changed with a different five-pound note?"; but I'm still unsure whether this sentence is grammatical and that it's the best way of asking the question.
I'd greatly appreciate it if you would provide me with a few sentences I could use in this situation.