Roast beef with potatoes, parsnips and sprouts. In the Napoleonic wars, the French rude nickname for Brits was 'rosbif'.

https://fr.wikipedia.org/wiki/Rosbif

Steamed sponge puddings like Spotted Dick

Cornish pasties

Meat pies like steak and kidney. Australians are mad about pies but they were a staple before the Brits took them there.

Shepherd's pie (it's not a pie so gets its own line).

Mustard with a nice kick. Not a meal, but it's very distinctive. It's closer to wasabi than to French mustard.

jugged kippers

kedgeree for breakfast (-: