for a custom-built body ) until 2002, standard Bentley and Rolls-Royce cars were usually nearly identical – Bentleys were badge engineered; only the radiator grille and minor details differed. In 1933, the colour of the Rolls-Royce radiator monogram was changed from red to black; because the red sometimes clashed with the coachwork colour selected by clients, and not as a mark of respect for the death of Royce later that year as is commonly stated. Crewe The British government built a shadow factory in Crewe in 1938 for Rolls-Royce where they could build their Merlin and Griffon aero engines. Car production was moved there in 1946 for space to construct bodies and to leave space for aero engines at Derby. The site was bought from the government in 1973. It is now Bentley Crewe. Second World War In 1940, a contract was signed with the Packard Motor Car Company in Detroit, Michigan, for the production of Merlin aero-engines for World War II in the USA. Production focused on aero engines but a variant of the Merlin engine, known as the Meteor, was developed for the Cromwell tank. The Meteor's development completed in 1943 the same team at the Belper foundry restarted work on an eight-cylinder car engine widening its uses and it became the pattern for the British Army's B range of petrol engines for post war combat vehicles in particular in Alvis's FV600 range, Daimler's Ferret, Humber's Hornet and Pig and Austin's Champ. Postwar diversification Motor bodies After the war, in 1946, Rolls-Royce and Bentley car production moved to Crewe where they began to assemble complete Rolls-Royce and Bentley cars with body pressings made by the Pressed Steel Company (see W. A. Robotham). Previously they had built only the chassis, leaving the bodies to specialist coach-builders. In 1939, Rolls-Royce brought one of the specialist coachbuilders completely in-house by buying the remaining capital of Park Ward Limited which, since 1936, in conjunction with Rolls-Royce had been building short production runs of all-metal saloon bodies on Bentley chassis. In 1959, Rolls-Royce bought coachbuilder H J Mulliner and the two businesses were put together as H J Mulliner Park Ward. Diesel engines Shrewsbury Luxury cars did not fit with the new mood of post-war austerity. After starting design and development of what became their C series diesel engine range in 1948, Rolls-Royce began to produce diesel engines in 1951. By 1955, it