• 
  Paul Brennen

   Lucky (3 episodes, 2015)
• 
  Robert Hands

   Mr Minton (2 episodes, 2015)
• 
  Roy Marsden

   Commander Haydock (3 episodes, 2015)
• 
  Robert Whitelock

   Conrad (2 episodes, 2015)
• 
  Aoife McMahon

   Sheila Perenna (3 episodes, 2015)
• 
  Alyy Khan

   Major Khan (2 episodes, 2015)
• 
  Christina Cole

   Mrs Sprot (3 episodes, 2015)
• 
  Issy Van Randwyck

   Mrs Minton (2 episodes, 2015)

• 
  Pinar Ögün

   Veronika Urbanowicz (3 episodes, 2015)
• 
  Hannah Waddingham

   Blonde Assassin (3 episodes, 2015)
• 
  Ed Speleers

   Carl Denim (3 episodes, 2015)
• 
  Madeline Appiah

   Annette (3 episodes, 2015)
• 
  Danny Lee Wynter

   Gilbert Worthing (2 episodes, 2015)
• 
  Alice Krige

  Rita Vandemeyer
• 
  James Fleet

  Carter

• 
  Andrew Havill

  James Peel KC
• 
  Clarke Peters

  Julius Hersheimmer
• 
  Jonny Phillips

  Whittington
• 
  Matthew Steer

  Albert
• 
  David Walliams

  Tommy Beresford
• 
  Camilla Marie Beeput

  Jane Finn
• 
  Jessica Raine

  Tuppence Beresford