Guest Stars Mark Dexter as Timothy Gray Steven Robertson as Malcolm Crowley Ed Birch as Harry Michael Gould as Deputy Commissioner Wainwright Jocelyn Macnab as Claire Elliot Kerley as Sam Anastasia Hille as Angela Simon Williams as Cavendish Thomasin Rand as Mary John Lightbody as Sergeant George Matthew Cullum as Constable Barry Joanna Brookes as Mrs. Cross Simon Sherlock as DCI Compton Co Starring Kieran Bew as Clerk on Train Angela Curran as Woman