• 
  Rutger Hauer

  Tillman
• 
  Susan Wokoma

   Frankie (3 episodes, 2017)
• 
  Claudia Jessie

   Lucy (3 episodes, 2017)
• 
  Edward Easton

   Simon (3 episodes, 2017)
• 
  Sanjeev Bhaskar

   Mr. Pradeep (2 episodes, 2017)
• 
  Tanya Franks

   Jane Bison (2 episodes, 2017)
• 
  Jo Joyner

   Dr. Kelly (3 episodes, 2017)
• 
  James Atherton

   Dr. McKenzie (2 episodes, 2017)

• 
  Chris Wilson

  2 episodes, 2017
• 
  Carla Harnell

  2 episodes, 2017
• 
  Toby Williams

  2 episodes, 2017-2019
• 
  Sinead Keenan

  5 episodes, 2019
• 
  Daniel Mays

  6 episodes, 2019
• 
  Jo Enright

  2 episodes, 2017-2019
• 
  Siobhan McSweeney

  3 episodes, 2019

• 
  Mathew Horne

  Mark
• 
  Samantha Spiro

  Rebecca
• 
  Bryony Hannah

  Penny
• 
  Sophie McShera

  Pippa
• 
  Marc Warren

  Graham Post