Though five years of pent-up demand ensured plenty of buyers production was hampered by shortage of materials, particularly steel, issued to manufacturers until the 1950s by a central planning authority under strict government control. Jaguar sold Motor Panels, a pressed steel body manufacturing company bought in the late 1930s, to steel and components manufacturer Rubery Owen, and Jaguar bought from John Black's Standard Motor Company the plant where Standard built Jaguar's six-cylinder engines. From this time Jaguar was entirely dependent for their bodies on external suppliers, in particular then independent Pressed Steel and in 1966 that carried them into BMC, BMH and British Leyland.