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1878 Born in Nottingham on 20 February
1897 entered the motor trade
Drove in all early motor trials, including the 1,000 Mile Trial of 1900, and won a first prize
1900 P. Richardson was in the motor trade, of 47, Holborn Viaduct, E.C. (Daimler Motor Co)
1903/4 for first time directed the complete design of a car, the Brotherhood, later known as the Sheffield-Simplex.
1904 'RICHARDSON, Percy. Car: Brotherhood. Was for several years London manager of the Daimler Motor Co., but resigned in December, 1903, to take up the general management and a seat on the Board of the Brotherhood-Crocker Motors, Ltd., a private company recently formed in connection with the old established engineering firm of Peter Brotherhood, Westminster Bridge, London. The Brotherhood-Crocker Motors, Ltd., intend manufacturing a high-class motor carriage on simplified Mercedes lines, and also cars and wagons for commercial purposes. Mr. Richardson has been a motorist since 1897, and has toured on a motor in every part of Great Britain. He desires to see England the chief motor manufacturing country of the world. Clubs: Nottingham Automobile, A.C.G.B. & I.' 
1906/7 directed the works at Sheffield for the production of "Sheffield-Simplex" cars
1910 Biographical information and image at Automotor Journal 19100402
1911 Living at Pendennis, Dore, near Sheffield: Percy Richardson (age 33 born Nottingham), Motor car Engineer working for a Motor Car Manufacturer. With his wife Annie Richardson (age 32 born Dublin) and their daughter Shelagh Patria Richardson (age 4 born West Norwood). Two servants.
1918 Received O.B.E.
1919 Left the position of Man. Dir. of Sheffield-Simplex Motor Works
1923 Having been engaged in the development and production of cars up to this date, then moved into other work.
1939 Percy Richardson 61, Automobile & Aero Engineer (In War Production), lived in Fulham with Patricia A Richardson, 61, Shelagh P Richardson 33
1955 Died in Fulham
1955 Obituary 
We have also learned with regret of the death, on October 8th, of Mr. Percy Richardson, a director and former chairman of Foster, Yates and Thorn, Ltd., Blackburn.