One of his sons, George Clemens, said: “He was a true inspiration.”
“The world has lost a really great man who has given so much.”
Clemens wrote for various television series including The Baron, The Persuaders, The Protectors, Danger Man, The Invisible Man, Thriller and Bergerac.
He had his first work commissioned by the BBC in 1955 and went on to become a staff writer for a film and TV production company, before enjoying considerable success with a huge number of TV scripts in the 1960s.
His production companies created The New Avengers and The Professionals, while Clemens also wrote for a number of US shows including Remington Steele, Perry Mason and the Highlander TV series.
He also wrote and produced for Hammer Films, receiving his OBE in the Queen’s Birthday Honours.