[2] In 1980 St Quinton started Saint Group Plc, an office equipment company, which was sold to Danka in 1993.
St Quinton served as the UK managing director of Danka, where he worked for over seven years, overseeing photocopier equipment sales exceeding £1bn.
[3] He then founded Azzurri Communications, a UK based voice and data integrator, which grew to 700 staff and £150 million turnover in six years.
He is also a race horse owner and in 2019 was appointed chairman of Cheltenham Racecourse, taking over from Robert Waley-Cohen.
He and his wife, Judith St Quinton, are trustees of The Fold, a children's home in the Limpopo Province in South Africa.