"The Ministry of Ungentlemanly Warfare: Churchill's Mavericks" by Giles Milton describes a lot of the equipment that SOE developed - e.g. the original limpet mi

"The Ministry of Ungentlemanly Warfare: Churchill's Mavericks" by Giles Milton describes a lot of the equipment that SOE developed - e.g. the original limpet mine depending on condoms and boiled sweets and, of course, developed in someone's shed and tested at the local swimming pool.