Lots of slogans such as "Be like Dad, Keep Mum" and "Keep it under your Hat" are visible on the walls in various scenes to reinforce the plot of this British wartime movie illustrating how gossipy talk can result in unknowingly giving valuable information to Nazi spies.
No 23: Mr Davis
Beppie Leemans
Maj. Richards
Brigade Major Harcourt
Lt. Cummins
Miss Clare
Mrs. Webster
Naval captain
Mr Vemon
Brigadier Blunt
Intelligence officer
German General
ATS drover with puncture
Colonel
Neutral Seaman - Irish Joe
Careless Talker on Train
Careless Talker on Train
Lance-Corporal
Wing-Cmdr. Kenton
Naval Officer (uncredited)
Builder's Labourer (uncredited)
Soldier in Buffet Car (uncredited)
General Cooper (uncredited)
Director
Writer
Producer