The Whitlock company, based in London, England, started as a carriage builder in 1778, moved into the car industry in 1903 and finally closed in 1991.
In 1904 the range was expanded with (probably) engines and chassis from the French Aster (Ateliers de Construction Mecanique l'Aster) company again probably with Whitlock's own coachwork.
Aster manufactured engines in Saint-Denis, Paris, in single, twin or four cylinder configurations, and in 1904 they also produced a chassis.
It also turned to car body making and in the early 1900s opened a London works run by William Lawton-Goodman, Jo Lawton's nephew.
During the war years the company concentrated on building ambulances on both its own and other makers' chassis and fuselages for De Havilland DH4 aircraft.