I live in the UK, and the thing I thought summed up the British and Irish obsession with mayonnaise best was when I recently bought a hoi sin duck wrap at the local Tesco and it had "No mayo" in big letters on the front, as if the lack of may was something highly unusual and/or edgy.

Since then I've looked at the ingredient list of every other product with great suspicion, expecting to find mayo everwhere...