English entrepreneur known for pioneering work in the field of consumer electronics, particularly during the 70's and 80's.
He sold electronics by mail order rather than going to college.
His Sinclair Radionics company produced the first-ever slim-line electronic pocket calculator in 1972.
He has children named Belinda, Crispin and Bartholomew.
He defeated Keith Allen during the Late Night Poker televised celebrity poker competition.