His film debut was They Were Not Divided (1950).
David Niven attempted to mention his friend's name in every film he made. On the set of Wuthering Heights (1939) the director, William Wilder warned him against trying to drop the word Trubshawe into any of the dialogue. He thwarted Niven's attempts on at least one occasion. In the end Niven convinced a prop man to write Michael Trubshawe's name on a tombstone, giving Niven a minor triumph over Wilder.
Close friend of David Niven. They served together in a Highland Regiment in Malta in the 1930s and Trubshawe figures prominently in Niven's biography, The Moon's A Balloon. Niven states "He swiftly made a name for himself in television and one of his earliest screen appearances was in The Guns of Navarone - a lovely bonus for me." Niven does not mention Trubshawe's earlier appearance in Around the World in 80 Days. Trubshawe was Niven's best man on the occasion of his two marriages, and also godfather to Niven's son David, Jr.