Reparto
André Morell
Supt. Folland
Julian Amyes
Slater
Harry Locke
Andy - Telephone engineer (uncredited)
Tony Quinn
Chemistry lecturer (uncredited)
John Harvey
Scotland Yard Man
Glyn Houston
Railway shunter (uncredited)
Laurence Naismith
Reginald Gordon-Wells
Mary Morris
Anna Braun
John Bailey
Stringer
Sam Kydd
Sam - Printer (uncredited)
Marianne Stone
Alfie's Mother (uncredited)
Patric Doonan
George Ellis
Peter Jones
Announcer at Music Club (uncredited)
Charles Lloyd Pack
Percy Ward
Kenneth Griffith
Jimmy Ellis
Joan Hickson
Mrs. Ellis
Victor Maddern
Anarchist (uncredited)
Julian Somers
Scottish Police Sergeant (uncredited)
Jack McNaughton
Benson - Scotland Yard man
Ian Wilson
Glass collector (uncredited)
Anthony Bushell
Maj. Elliott
Douglas Ives
Mr Mathews - Union Rep (uncredited)
Liam Redmond
Cmdr. Robert Brennan
Alfie Bass
Albert Brewer (uncredited)
Moultrie Kelsall
Ship's Captain (uncredited)
Lockwood West
Home Secretary (uncredited)
Jean Anderson
Woman in street (uncredited)
Richard Massingham
Music Society member (uncredited)
Dora Bryan
Mrs. Bowers
Anthony Nicholls
Grant Mansfield
Geoffrey Keen
Morgan Williams
Julien Mitchell
Mr Philips - Union Rep (uncredited)
Bruce Seton
(uncredited)
Michael Ward
Music Club member (uncredited)
Harry Fowler
Street photographer (uncredited)
Everley Gregg
Mrs Finch-Harvey - Music Club member (uncredited)
Dandy Nichols
Woman scrubbing porch step (uncredited)