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School for Secrets (also known as Secret Flight) is a 1946 British black-and-white film written and directed by Peter Ustinov and starring Ralph Richardson. In leading supporting roles were David Tomlinson, Raymond Huntley, Finlay Currie, Richard Attenborough, John Laurie and Michael Hordern. Based on a 1942 RAF training film for would-be 'boffins' and developed with the full cooperation of the Air Ministry, the film celebrates the discovery of radar, its discoverers and the enabling culture. imdb.com