Though his main job was as a commentator for Gaumont British News, he was frequently used as a narrator for films from the 1930s to 1950s.
In the first series of Dad's Army broadcast in 1968 he was the narrator over the humorous short Public Information Films of the platoon seen at the beginning of each episode.
Emmett was born in Brixton in London in 1902, the son of Elizabeth Annie née Denyer (1871–) and Josephus Walter Victor Emmett (1872–1941), an insurance clerk.
[2] In addition to his work as a narrator Emmett was also a screenwriter for Under the Southern Cross (1957), Dance Hall (1950),[3] Bothered by a Beard (1945, which he also produced and directed), The Lion Has Wings (1939)[4] and Sabotage (1936), along with additional dialogue for Young Man's Fancy (1940), The Ware Case (1938) and Non-Stop New York (1937).
In 1949 he married Joyce Annette Stanley (1917–1997) in London.