He played the role of Mike Abbott in sit-com series Bless This House during its entire 1971–76 run; due to prior commitments he did not feature in the film version of the series.
After being asked to go to New Zealand for a telethon and subsequently taken back to host his own show, Stewart ended up being asked to relocate where he became involved with such soaps as The Young Doctors as a villainous character trying to silence a blind patient who had overheard his criminal acts, and Sons and Daughters as the villainous doctor Ross Newman.