British food is underrated and going by most of the postings here, many people are ignorant of what there is. To say that there are foods from many cultures is true but it has little to do with British food.
There are many fine British dishes and I would like to recommend a cookbook.
Gary Rhodes has written some great modern British cookbooks. (see below)
British food is not just roast meats and fish & chips or deep fried Mars Bars.
It is Cullen skink, haggis, black pudding, meat puddings and pies, sweet pies such as rhubarb or apple, shortbread, herrings in oatmeal, lamb and mint sauce ( Our lamb is a different animal), stovies, champ, toad in the hole, Yorkshire pudding, Steak (from the land that invented Angus and Hereford cattle!), Sunday lunch with a great big piece of roast meat, game, Steak and kidney pie, venison, grouse, pheasant, fresh wild salmon, Arbroath smokies, Finan Haddock, kippers, scallops, lobster, dressed crab, Dover sole, Cumberland sausage, sausage rolls, crumpets, scones, oatcakes, date & walnut cake, Christmas cake (rich fruit cake), queen of puddings or bread pudding, apple crumble, rice pudding, summer pudding, Stilton and real cheddar cheese etc etc.
I could go on and on.
To drink, Beer. Real ale and cider.
English wine are OK but nothing more. They are also expensive in relation to their quality. Whisky of course but there are also many interesting liqueurs and fruit wines.
I could write a book on the subject.
On revising, I noted I have more or less omitted vegetables. This is not because there are none but because main dishes normally are served with vegetables. Potatoes, peas, beans, turnip, Brussels sprouts, lettuce, cabbage, carrots, parsnips, asparagus, tomatoes, cauliflower, and so on. It is also usual nowadays to have fruit and veg from Spain such as peppers, courgettes, Koss lettuce, etc.
ISBN 0563534117 for example.