Marathon (1968) Marathon came to the UK courtesy of Forrest Mars Sr, estranged from the family business in the States, but free to adapt the recipes for European tastes. Aside from his eponymous bar packed with milk, sugar, glucose, and thick, thick chocolate, Mars' Slough-produced cash cow was a peanut-powered derivative of the American Snickers (the name was apparently tribute to the Mars family's favourite horse)  'brand alignment' saw Marathon adopt its maiden name in 1990
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