Vito ! we are from the NW originally, I well remember Shirley Valentine saying chips and egg, thinking, what? its egg and chips, who wrote this? of course it was Willy Russell, NW born and bred, also wrote the screenplay.
I never heard ‘chips and egg’ before or since, it just doesn’t scan, drove us mad too.
The standout regional differences Ive noticed are bread and cakes, as in barmcakes/baps, breakfast rolls/cobs, oven bottoms/muffins (of course now my brain has seized so that I cannot think of any others, help!)
On visiting friends in Yorkshire, into the chippy, friend ordered a ‘breadcake’ I thought, that is a bap!