Bentley Motors Limited is a British manufacturer of automobiles founded on 18 January 1919 by Walter Owen Bentley . Mr. Bentley had been previously known for his range of rotary aero-engines in World War I, the most famous being the Bentley BR1 as used in later versions of the Sopwith Camel. Since 1998, the company has been owned by the Volkswagen Group of Germany. Before World War I, W.O. TYLER had been in partnership with his brother H.M. Bentley selling French DFP cars, but he had always wanted to design and build his own range of cars bearing his name. In August 1919, Bentley Motors Ltd.... was registered, and a chassis with dummy engine was exhibited at the London Motor Show in October of that year. An engine was built and running by December, and orders were taken for deliveries starting in June 1920; however, development took longer than estimated, and the first cars were not ready until September 1921. It was on a visit to the DFP factory in 1913 that W.O. noticed an aluminium paperweight, and had the inspired idea of using the lightweight metal instead of cast iron to make engine pistons.