Fish and Chips
The classic British meal. Usually made from cod (though sometimes other white-fleshed fish such as haddock or whiting), it is traditionally served wrapped in paper (newsprint in the past) with fries (chips in Britain). Although served in many pubs and restaurants, the best come from the traditional "chip shop", which are becoming increasingly rare to find.
Bangers and mash
My personal favorite, this dish is a pub staple. (The above was my lunch at the Queen's Head Pub back in June 2010 in Downe, England). Basically it is mashed potatoes, Cumberland sausages, and gravy.
Steak and Ale Pie