|Died||31 May 1994 86) (aged|
|Spouse(s)||Beryl Brewer (1910–1981)|
He was the son of George Gilliat, editor of the Evening Standard from 1928 to 1933. Sidney was born in the district of Edgeley in Stockport, Cheshire. In the 1930s he worked as a scriptwriter, most notably with Frank Launder on The Lady Vanishes (1938) for Alfred Hitchcock, and Night Train to Munich (1940), directed by Carol Reed. He and Launder made their directorial debut co-directing the home front drama Millions Like Us (1943). From 1945 he also worked as a producer, starting with The Rake's Progress, which he also wrote and directed. He and Launder made over 40 films together, founding their own production company Individual Pictures. While Launder concentrated on directing their comedies, most famously the four St Trinian's School films, Gilliat showed a preference for comedy-thrillers and dramas, including Green for Danger (1946), London Belongs to Me (1948) and State Secret (1950).