A group of scientific friends from Cambridge were planning a trans-Sahara expedition from Morocco to Algeria in 1970 and needed a navigator. He accepted with alacrity and the expedition members became friends for life. As well as plotting the route, Pigott doled out the expedition’s rations, including one Mars bar per day per man. After two weeks the team doctor pointed out that everyone had lost weight other than the rations officer. Pigott came clean, confessing to his chocolate addiction.