Ray Boggiana, the food technologist who helped in developing the range, says lettuce and tomatoes have been left out from the ingredients, as they tend to go soggy.
The new technology sandwiches will soon be available in thousands of shops across the country.
The rest of the procedure for enhancing the shelf life was down to basic food technology i.e. removing the oxygen from the packaging and replacing it with nitrogen and carbon dioxide.
"The science is not new. It''s all about using a protective atmosphere in the packaging. It's the same technology that is used in packaged sliced meats," the Telegraph quoted him as saying.
However, the only other trick is to mix the main ingredients in mayonnaise, which stops the fillings from deteriorating, he explained.
Boggiana insisted that the sandwiches tasted exactly the same after 14 days as they did on the second day.
However, food writer Rose Prince feels depressed at the very thought of such kind of sandwiches.
"Why? Why make something that could last for such a long time? Is this for people planning to pack a sarnie on a trip to scale Mount Everest?" she questioned.

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