Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,192 pages of information and 233,429 images on early companies, their products and the people who designed and built them.
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.