"An instructional film released by the UK Warning and Monitoring Organization which depicts its operations in the lead-up to and aftermath of a hypothetical nuclear attack on the United Kingdom."
John Welsh
as Sector Controller
Tony Thawnton
as Chief Meteorological Officer
Edward Underdown
as Duty Controller
Valerie Van Ost
as Nurse
Michael Smee
as Post Chief Observer
Larry Martyn
as Post Observer
Guy Standeven
Ian Patterson
as Doctor
Richard Butler
as ROC Sector Officer
John Graham
as Chief Scientist
Brian Forster
as Chief Warning Officer
Michael McStay
as French Liaison Officer
Jill Cary
Edward Dorian
Production Manager
Laurie Clarkson
Sound
Anthony Short
Director
Writer
Cyril Randell
Producer
Alf Hicks
Cinematography
Gordon Hales
Editor
W. J. Carney
Technical Advisor