 Watson appeared in Coronation Street as Bill Gregory on and off between 1961–1984 ; his final episode in 1984 was also the final episode for Pat Phoenix who played his love interest Elsie Tanner in the series.He appeared as a powerful but shell-shocked ex-soldier in "Dr. Finlay's Casebook", in an episode entitled "Not qualified" which formed part of the 8th series of the popular British programme.Probably his best-known television role was as Llud, Arthur's craggy sidekick in "Arthur of the Britons".