Severe food allergies are now so common that you'd have trouble finding a Canadian who can't tell you precisely how a peanut differs from a tree nut. Anyone who cooks is gonna know, likewise anyone who shops for groceries, anyone who works in a restaurant, anyone who works in food preparation of any kind, anyone who has children or routinely spends even a little time with children ... That's a lot of people.

Brit mileage may vary, but I doubt it.