Mixed leaves

Just popped out for a sandwich. Ordered a baguette with pastrami, gherkin and mixed leaves. While putting this together, the woman in the deli told me she only had iceberg lettuce and checked that this was OK. Fine by me, but it makes me wonder – are there people in London who would complain about only getting one kind of lettuce leaf in their sandwich? “Oi! It says MIXED leaves up there! I’ve only got iceberg! What are you trying to do me? This is a disgrace! Give me some lollo rosso in this RIGHT NOW or I want my money back!’ Sounds like a scene from Curb Your Enthusiasm.