I would say it is fried eggs, fried bacon, mushrooms, hot soggy tomatoes, a dollopp of baked beans and chips (thick french fries drowned in vinegar), sausages and toast/fried bread. Some people also eat black pudding with it, but I think that's scottish. Most cafes now sell it as all-day-breakfast. It's great (I just leave the chips and toast) and quite cheap.