In television, Wymark was best known for his role as the machiavellian businessman John Wilder in the twin drama series The Plane Makers and The Power Game (which were broadcast from 1963 to 1969), which led to offers of real company directorships and the British Academy Television Award for Best Actor in 1965. However, Wymark was a gentle person in real life and was, by his own admission, ignorant of business matters. He considered the character of Wilder a "bastard" and was described by his wife Olwen as "the most inefficient, dreamy muddler in the world."[3] In the mid-1960s, Wymark was considered as the replacement for William Hartnell in the title role of Doctor Who.[citation needed]
In 1960, Wymark appeared in the Danger Man television series episode entitled "An Affair of State" as the corrupt police commissioner Ortiz.[4]
Wymark married American playwright Olwen Buck (known as Olwen Wymark) in 1953; the couple met while both were students at University College, London. He took his acting name from his wife's paternal grandfather, the writer William Wymark Jacobs. The couple lived near Parliament Hill in Hampstead, London, and had four children, including the future actress Jane Wymark. Wymark died suddenly in Melbourne, Australia on 20 October 1970, aged 44, of a heart attack in his hotel room. He had been due to star in the play Sleuth at the Comedy Theatre three days later. On the night of his death, he was to appear on the TV variety programme In Melbourne Tonight.[5] He, guest Richard Deacon and host Stuart Wagstaff had just appeared together in a TV production of Hans Christian Andersen stories and his non-appearance led to several jokes by Wagstaff and Deacon.[6] Host Wagstaff was informed of Wymark's death mid-way through the programme and announced it at the end.
Wymark was a Roman Catholic. He was buried at Highgate Cemetery in London, after a Requiem Mass. A memorial service was later held at Brompton Oratory.[7] Wymark View—located in his home town, Grimsby—is named after him.