Other credits included My Good Woman (1973–1974), A Horseman Riding By (1978), Inspector Morse, It Ain't Half Hot Mum, Minder and Doomwatch, as well as the recurring character "Det Supt Jones" in Softly, Softly. He has also appeared twice as different characters in Doctor Who — as "Professor Owen Watson" in The Hand of Fear (1976) and as "Colonel Ben Wolsey" in The Awakening (1984). He also played Brother Cadfael in a 1979 BBC Radio 4 adaptation of One Corpse Too Many. Houston has over two hundred television and film credits, dating back as early as 1950. Houston won a BAFTA Cymru special award in April 2008.