Okay, so there is some debate as to whether this item originated in the United States or Germany. For the sake of argument, let's call it a tie. As the flagship product at places like McDonald's and Burger King, as well as thousands of cheap imitations, the hamburger is very popular in all parts of Britain, often accompanied by the perhaps equally popular French fries.
2. Submarine sandwich (sub)
Mainly due to the widespread introduction of a little sandwich franchise known as Subway, the submarine sandwich is more popular in Britain now than ever. The first Subway store in Britain was opened in Brighton in 1996, and has since been followed by almost 1500 more locations.
A product of Mars, Incorporated, who also introduced Brits to Snickers, Mars and Twix, M&Ms have been a mainstay of British shopping aisles since the 1980s, and are famous there for "melt(ing) in your mouth; not in your hand." They are not to be confused with Smarties, a Nestlé-owned product that, according to various studies, are alone in having the answer (see Smarties slogan).
Alright, so this is technically a drink item, but given the historical relevance of the product, I felt it was worthy of inclusion in this list. Coca-Cola, manufactured (not-surprisingly) by the Coca-Cola Company, became the first brand to exceed £1 billion in annual UK grocery sales in 2010, and is followed distantly by other soft drinks (or is it fizzy drinks?) such as Pepsi and Dr. Pepper.
5. Corn Flakes
Like many cereals - including Coco Pops (Cocoa Krispies in the U.S.), Frosted Flakes and Rice Krispies - Corn Flakes are a product of The Kellogg Company, a multinational food manufacturer based in Battle Creek, Michigan. Kellogg items make up a large majority of cereal sale in Britain, with Corn Flakes being among the most popular.
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