• 
  Nathan Stewart-Jarrett

  Ian / Ian Johnson
• 
  Fiona O'Shaughnessy

  Jessica Hyde
• 
  Alexandra Roach

  Becky
• 
  Emilia Jones

  Alice Ward
• 
  Kevin Eldon

  Tony Bradley
• 
  Ian McDiarmid

   Anton (5 episodes, 2014)
• 
  Stephen Rea

  Letts
• 
  James Fox

   Assistant (6 episodes, 2013)

• 
  Ruth Gemmell

  Jen Dugdale
• 
  Paul Higgins

  Michael Dugdale
• 
  Geraldine James

  Milner
• 
  Sylvestra Le Touzel

   Leah (5 episodes, 2014)
• 
  Anna Madeley

  Anya
• 
  Neil Maskell

  Arby
• 
  Alistair Petrie

  Geoff

• 
  Paul Ready

  Lee
• 
  Adeel Akhtar

  Wilson Wilson
• 
  Oliver Woollford

  Grant
• 
  Alan Bentley

  Scientist
• 
  Isabelle Estelle Corbusier

   Kristina (6 episodes, 2013)
• 
  Simon McBurney

  Donaldson