Chapotraphouse

Potatoes, sausages and cabbage, with a variety of soups or stews was pretty typical for working class British. Curry is especially popular, though I guess that is an 'Indian' dish but it has been around Britain for over a century now. Otherwise yeah, fish and chips are a pub staple.

Honestly the nasty stuff was usually the weird like, jellied eels, stuff that was preserved over the winter before refrigeration was a thing.

If you want specifically the British things that some working class people will traditionally eat regularly - Yorkshire puddings, toad in the hole, bubble and squeak, bangers and mash, pies, pasties, sunday roasts, meat+veg+chips, shepherd's pie, full english (esp bacon), are all on the list of dinners for example. Roasts, full breakfasts, wellingtons etc might be considered high cuisine, but the rest is just decent everyday staples.

Other than that.. fairly standard western diet, really.