Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 128,828 pages of information and 203,450 images on early companies, their products and the people who designed and built them.
of 55a Southwark Park Road, Bermondsey.
of Welbeck Works, Kimberley Road, Willesden Lane, Kilburn
1900 business founded by Frederick Simms
1901 January. Details of the 3.5hp Voiturette.
1901 March. Details of the 6-hp water-cooled motor.
1901 March. Details of the Simms Military motor.
1902 January. Announce four-cylinder engines of 20, 30 and 50-hp.
1904 to 1907 Built cars and commercial vehicles, van and heavier chassis, as well as engines for other manufacturers
1905 June. Details of the Simms-Welbeck cars. 12-hp, 20-hp and 26-hp. 
1905 September. Details of the T.T. car.
1906 A bodied single-decker for Durham and District Motor Omnibus Co was delivered from London. This journey took over two days to cover and was 270 miles in distance.
1908 Mr H W Forster MP had the steam engine in his yacht replaced by a 100hp Simms motor
1909 Exhibited aircraft at Olympia Show
1909 Last listing of Simms-made car.
1913 Simms established Simms Motor Units at East Finchley
1920 The Kilburn works were virtually destroyed by fire; the slump of 1920–21 in the engineering industry ended Simms's manufacturing until 1926.
The oldest vehicle in the Royal Automobile Club (RAC)'s Heritage Fleet is the 1900 Simms, registered 1 RAC, built by the club's founder. With tiller steering, solid tyres and slightly later 6hp engine fitted, it is thought to be a prototype and probably older than its registration date
Appeared in the 2009 London to Brighton Veteran Car Run as well as the 2011 run (see photo).