Michael Redgrave
Ruxton Towers Reformatory Governor
James Fox
Willy Gunthorpe - Ranley School Runner (uncredited)
Arthur Mullard
Chief Borstal Officer (uncredited)
Dallas Cavell
Lord Jaspers (uncredited)
Frank Finlay
Booking Office Clerk (uncredited)
Robert Percival
Tory Politician (uncredited)
Derek Fowlds
Borstal Inmate (uncredited)
Billy Murray
Borstal Inmate (uncredited)
Ernest Blyth
Army Officer at Sports Day (uncredited)
Brian Hammond
Johnny Smith - Colin's Brother (uncredited)
William Ash Hammond
Johnny Smith - Colin's Brother (uncredited)
Victor Harrington
Army Officer at Sports Day (uncredited)
Fred Machon
Borstal Master at Meeting (uncredited)
Anita Oliver
Alice Smith - Colin's Sister (uncredited)
Christopher Parker
Bill Smith - Colin's Brother (uncredited)
Joe Phelps
Borstal Master in Workshop (uncredited)
Corin Redgrave
Spectator at Sports Day (uncredited)
Doug Robinson
Prison Warder (uncredited)
Robert Vossler
Plainclothes Policeman (uncredited)
John Wilder
Ranley Headmaster (uncredited)