Cone of Silence
The aircraft featured in the film is an Avro Ashton 3. It was built as a research aircraft and at the time of filming was being employed by Bristol Siddeley Engines (now Rolls Royce) in engine testing.,A screen version of David Beaty's novel that like most films made sixty years ago looks better today than at the time, although the model work is a bit obvious. Made by Michael Balcon's company Bryanston, hence the job of directing it going to his former Ealing employee Charles Frend.

Both composer Gerard Schumann and cameraman Arthur Grant also did distinctive work in horror films (as did many of the cast, which includes Hammer Films' Holmes & Watson from 'The Hound of the Baskervilles'), while Tony award-winning dancer Elizabeth Seal plays her only ever film lead as Bernard Lee's daughter.,