He had a lengthy career in a large number of television programmes. Possibly his best-known role was in When the Boat Comes In, a popular 1970s series, where he played the part of Matt Headley.
His film career includes appearances in The First Great Train Robbery (1978), McVicar (1980), The Plague Dogs (1982, voice only), Slayground (1983), The Bounty (1984) as Thomas Huggan, ship's surgeon, Mata Hari (1985), Revolution (1985), Scandal (1989), and Chaplin (1992).
His TV appearances include:
One episode of 'Rooms' (1974)
In April 2011 he appeared as Len Merryman in an episode of Midsomer Murders.
In 1958, and prior to going to drama school, Terris was a trainee reporter on the Sunderland Echo, the town's evening paper.