The origins of the Deep Fried Mars Bar are disputed but all of the people doing the disputing appear to be here in Scotland?

https://en.wikipedia.org/wiki/Deep-fried_Mars_bar

They were supposedly invented in Scotland, and I've not seen them sold in an English fish and chip shop. Go to Scotland however and they're not uncommon.

https://en.wikipedia.org/wiki/Deep-fried_Mars_bar