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The Rootes Group was a British automobile company which started as a distributor in Kent and grew into a manufacturer based in the UK Midlands.
19th century: A cycle-repair and construction business was established by Mr Rootes, father of William Rootes, (Senior) in Goudhurst, Kent.
1917 The Rootes set up a private company called Rootes Ltd to acquire the Maidstone branch of the motor business of William Rootes, (Senior) which was engaged in repair of aircraft engines and manufacture of aircraft parts
Growth was based on the distribution of cars, in particular the innovative methods of export, administered from Devonshire House, Piccadilly, with a packing depot on the Thames at Chiswick.
1928 Rootes acquired control of Hillman
1933 Name of holding company changed to Rootes Securities Ltd ; Humber Ltd became the manufacturing division and Rootes Ltd controlled distribution, property, and hire-purchase financing subsidiaries.
1937 Purchased British Light Steel Pressings
1939 Purchased Thrupp and Maberly.
1939 Company name changed
As Rootes grew and took over other companies, it became one of the earliest advocates of the policy of "badge engineering". Hillman was intended to be the basic brand, Singer slightly more upmarket, Sunbeam was the sports brand, while Humber made luxury models. Commer and Karrier were the commercial vehicle brands, with Commer manufacturing light vans with the Karrier badge appearing on heavy vans and light duty trucks (mainly for municipal use).
WWII Like most other British car manufacturers, Rootes produced armaments including aircraft, aero-engines, armoured vehicles and commercial vehicles.
In 1940, under the Government's shadow factory scheme, Rootes built its massive assembly plant in Ryton-on-Dunsmore, near Coventry, initially manufacturing aircraft, one of the first types being the Bristol Blenheim. Production included one of the RAF's heavy bombers, the Handley Page Halifax. Following the war, the plant was the main focus of the company's passenger car operations. Rootes also sponsored satellite manufacturing operations around the world, notably in Australasia and the Middle East. The best known example of the latter being the Iranian-built Paykan, based on the Hillman Hunter.
by 1941 the Rootes Group was advertised as the name of the overall Group
After WWII J. Brockhouse and Co acquired the Sunbeam and Karrier trolleybus business from Rootes
1949 Incorporated as a public company; name changed to Rootes Motors Ltd.; Ordinary shares, most of which were held by the Rootes family, were not available to the public. Employed 17,000 persons. 
Rootes Ltd continued as a distributor.
1954 Members of the Rootes Group include:
1967 The 30 companies in the Rootes group were consolidated into 2 - Rootes Motors Ltd and Rootes Pressings (Scotland) Ltd - in order to reduce admin expenses