I concur, lived here for a long time and I've noticed stuff like Spotted Dick, Toad-in-the-hole, Haggis, and Faggots (which are a kind of meatball).
If I were to point at a dish that was probably more popular in the past it would be fried eel, which you can still find in certain places in London.
BWS, never heard of it, family is British and they've not heard of it either.