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.