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The British public eat over 11.5bn sandwiches every year, spending around £8bn in the process, according to the British Sandwich Association (yes, there really is such a thing).
But whether your choice is the classic cheese and tomato or the heartier chicken and bacon, your sarnie option could have more riding on it than you think.
Researchers from the University of Manchester carried out the first ever study into the carbon footprint of sandwiches, for both ready-made and home-made products.