• 
  Peter Vaughan

  Harry Grout (4 episodes, 1974-1977)
• 
  David Jason

  Blanco (4 episodes, 1974-1977)
• 
  Dudley Sutton

  Reg Urwin (1 episode, 1976)
• 
  Maurice Denham

  Rawley (3 episodes, 1974-1977)
• 
  Paul McDowell

  Mr. Collinson (4 episodes, 1974-1977)
• 
  Susan Littler

  Norma (1 episode, 1974)
• 
  Graham Crowden

  Prison Doctor (1 episode, 1975)
• 
  Paul Angelis

  Navy Rum (1 episode, 1974)

• 
  Christopher Biggins

  Lukewarm (5 episodes, 1974-1977)
• 
  Sam Kelly

  Warren  (11 episodes, 1974-1977)
• 
  John Bennett

  Medical Officer (1 episode, 1974)
• 
  Ken Jones

  Ives (4 episodes, 1974-1975)
• 
  Fulton Mackay

  Mr. Mackay (19 episodes, 1974-1977)
• 
  Tony Osoba

  McLaren (9 episodes, 1974-1977)
• 
  Richard Beckinsale

  Lennie Godber (19 episodes, 1974-1977)

• 
  Ronald Parker

  Norman Stanley Fletcher (20 episodes, 1974-1977)
• 
  Brian Glover

  Heslop (4 episodes, 1974)
• 
  Cyril Shaps

  Jackdaw (1 episode, 1975)
• 
  Ronald Lacey

  Harris (4 episodes, 1974-1977)
• 
  Barbara New

  Prison Visitor (1 episode, 1975)
• 
  Philip Jackson

  Melvin 'Dylan' Bottomley (1 episode, 1974)
• 
  David Daker

  Jarvis (2 episodes, 1974-1977)
• 
  Philip Madoc

  Williams (1 episode, 1975)
• 
  David N. White

  Blanco (4 episodes, 1974-1977)
• 
  John Quarmby

  Prison Officer (1 episode, 1974)
• 
  Andonia Katsaros

  Iris (1 episode, 1974)
• 
  Peter Jeffrey

  Mr. Wainwright (1 episode, 1975)
• 
  Graham Ashley

  Mr. Appleton (2 episodes, 1974-1975)
• 
  Brian Wilde

  Mr. Barrowclough (19 episodes, 1974-1977)
• 
  John Rudling

  Mr. Birchwood (1 episode, 1975)
• 
  Roy Sampson

  PT Instructor (1 episode, 1975)
• 
  Ronnie Barker

  Norman Stanley Fletcher