Ente les sos actuaciones teatrales figuren The Relapse (1950, como Sir Tunbelly Clumsey); La fierecilla domada (1951, como Grumio); The Way of the World (1954, Petulant); The Carefree Tree (1955, The Sixth Son); El rei Lear (1956, Duque de Cornualles); Mister Johnson (1956, Gollup); Saint Joan (1956, linquisidor); Protective Custody (1956, Dr. Steidl); Oscar Wilde (1957, Oscar Wilde); The Golden Six (1958, Tiberio); A Man for All Seasons (1961, Cardenal Wolsey); Andorra (1963, dueñu de pub); La gavilueta (1964, Sorin); Les bruxes de Salem (1964, Danforth); Baker Street (1965, Moriarty); The Royal Hunt of the Sun (1965, Miguel Estete); Ring Round the Moon (1966, Messerchann); Those That Play the Clowns (1966, Henning); Breakfast at Tiffanys (1966, Rusty Trawler); The Sorrows of Frederick (1967); The Bench (1968, Phillipi); Tíu Vania (1971, Serebryakov); The Jockey Club Stakes (1973, Sir Dymock Blackburn); The Dogs of Pavlov (1974).