[5] In 1951 he appeared at the Duchess Theatre in London's West End in the comedy play The Happy Family by Michael Clayton Hutton.

[6] In the 1970s Houston played Lord Peter Wimsey's valet Bunter opposite Ian Carmichael in television adaptations of several of Dorothy Sayers tales.

[8] Other credits included 'Peter Ridgway' in 'Colonel March of Scotland Yard' Episode 'The Stolen Crime' (1956), 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 also appeared twice as different characters in Doctor Who — as "Professor Owen Watson" in The Hand of Fear (1976)[9] and as "Colonel Ben Wolsey" in The Awakening (1984).

[11] A highlight of Houston's career was his appearance at the concert to celebrate the opening of the National Assembly for Wales in 1999[12] along with other actors such as Ioan Gruffudd and Harry Secombe.