Guest Stars Richard Armitage as Philip Durrant Jane Seymour as Rachel Argyle Gugu Mbatha-Raw as Tina Argyle Andrea Lowe as Maureen Denis Lawson as Leo Argyle Juliet Stevenson as Gwenda Vaughn Reece Shearsmith as Insp. Huish Camille Coduri as Mrs. Lindsay Stephanie Leonidas as Hester Argyle Tom Riley as Bobby Argyle Burn Gorman as Jacko Argyle Julian Rhind-Tutt as Dr. Arthur Calgary Pippa Haywood as Mrs. Price Alison Steadman as Kirsten Lindstrom Michael Feast as John Croker Bryan Dick as Micky Argyle Lisa Stansfield as Mary Durrant Carl Isherwood as Scientist James Hurran as Cyril Price