It stars Patricia Roc, Gordon Jackson, Anne Crawford, Basil Radford, Naunton Wayne, Moore Marriott and Eric Portman.

Radford and Wayne reprise their roles of Charters and Caldicott from The Lady Vanishes (1938) and Night Train to Munich (1941), both scripted by Launder and Gilliat and produced by Edward Black.

Hoping to join the WAAF or one of the other services, Celia instead gets posted to a factory making aircraft components, where she meets her co-workers, including her Welsh room-mate Gwen Price and the vain upper middle-class Jennifer Knowles.

Knowles dislikes the work they have to do at the factory, causing friction with their supervisor Charlie Forbes which eventually blossoms into a verbally combative romance.

The stock footage clips shown early on in the film of the "factory" where the aircraft is being made show a four engine Short Stirling bomber leaving the assembly hall and then taking off.

A nearby RAF bomber station sends some of its men to a staff dance at the factory, during which Celia meets and falls in love with an equally shy young Scottish flight sergeant Fred Blake.

After the wedding they spend their honeymoon at the same south coast resort as the Crowsons went to in 1939, finding it much changed with minefields and barbed wire defending against the expected German invasion.