 The prototype, designed by Morris-Commercial, registration number EOM 844 was built in 1940 and was fitted with a landaulette body by Jones Brothers of Westbourne Grove, London.It accumulated a recorded 300,000 miles (480,000 km) in tests throughout the Second World War.Changes in the Conditions of Fitness after the Second World War banned the landaulette style of body and the production vehicle was fitted with a fixed head body, of pressed steel over a wood frame.