He was in Peter Brook’s original production of the Marat/Sade with the RSC at the Aldwich Theatre and Fenton in The Merry Wives.
On television he was best known for his portrayal as Professor Cawston in the British science fiction serial The Tomorrow People.
While filming The Tomorrow People and playing Steve in A Streetcar Named Desire at the Piccadilly Theatre, he decided the acting was no longer what he wanted to do, and, when the run ended, started as a trainee social worker at his local Braintree office.
Later as "Tom Midway" in the 1964 BBC radio show "Repertory in Britain", in the segment "Semi-Detached".
In 1967, Stanyon played the voice role of "Peter" in the radio show "Thirty Minute Theatre".