Other plays in London included Crucifer of Blood at the Haymarket Theatre, House Guest, A Personal Affair, Suddenly at Home and Baggage.
After two years of national service in the British Army, he decided to abandon his medicine course at Cambridge University and successfully auditioned for RADA.
[4] Harper's film credits include The Admirable Crichton (1957), A Night to Remember (1958), The League of Gentlemen (1960), Tunes of Glory (1960), The Young Ones (1961), The Punch and Judy Man (1963), The Shoes of the Fisherman (1968) and The Lady Vanishes (1979).
[8][9] He toured the country in 2008 as the lead in Agatha Christie's And Then There Were None directed by Joe Harmston for producer Bill Kenwright.
[10] He also played one of the barristers in The Baccarat Scandal at Chichester Festival Theatre which starred Keith Michell.