After the end of the Second World War, Scammell Lorries looked at the Mechanical Horse, which was basically unchanged from its 1934 design, realised that something more modern was called for and set about re-designing the vehicle. Later Scammell offered diesel engines. These were the Perkins 4-199 for 3-ton and P4 and P4203 for six ton. The low mounting of the engine and other design changes made the Scarab more stable and its rounded all steel cab was more comfortable for drivers. The Scarab lasted in production until 1967.