of long-chassis four-seater tourers, dropheads and saloons also produced. Bertelli was a competent driver keen to race his cars, one of few owner/manufacturer/drivers. The "LM" team cars were very successful in national and international motor racing including at Le Mans. Financial problems reappeared in 1932. Aston Martin was rescued for a year by Lance Prideaux Brune before passing it on to Sir Arthur Sutherland. In 1936, Aston Martin decided to concentrate on road cars, producing just 700 until World War II halted work. Production shifted to aircraft components during the war. 1947–1972: David Brown In 1947, old-established (1860) privately owned Huddersfield gear and machine tools manufacturer David Brown Limited bought Aston Martin putting it under control of its Tractor Group. David Brown became Aston Martin's latest saviour. He also acquired without its factory Lagonda's business for its 2.6-litre W. O. Bentley-designed engine. Lagonda moved operations to Newport Pagnell and shared engines, resources and workshops. Aston Martin began to build the classic "DB" series of cars. In April 1950, they announced planned production of their Le Mans prototype to be called the DB2, followed by the DB2/4 in 1953, the DB2/4 MkII in 1955, the DB Mark III in 1957 and the Italian-styled 3.7 L DB4 in 1958. While these models helped Aston Martin establish a good racing pedigree, the DB4 stood out and yielded the famous DB5 in 1963. Aston stayed true to its grand touring style with the DB6 (1965–70), and DBS (1967–1972). The six-cylinder engines of these cars from 1954 up to 1965 were designed by Tadek Marek. 1972–1975: William Willson Aston Martin was often financially troubled. In 1972, David Brown paid off all its debts, said to be £5 million or more, and handed it for £101 to Company Developments, a Birmingham-based investment bank consortium chaired by accountant William Willson. More detail on this period may be read at Willson's biography. The worldwide recession, lack of working capital and the difficulties of developing an engine to meet California's exhaust emission requirements – it stopped the company's US sales – again pulled Aston Martin into receivership at the end of 1974. The company had employed 460 workers when the manufacturing plant closed. 1975–1981: Sprague and Curtis The receiver sold the business in April 1975 for £1.05 million to North American businessmen Peter Sprague of National Semiconductor, Toronto hotelier George Minden, and Jeremy Turner, a London businessman, who insisted