First broadcast 17th18th January 2011.br br At Hillsdon Army base, a training camp for soldiers fighting in Afghanistan, young soldier Mark Blakefield is still recovering from the death in action of his friend Danny Ferris and argues with Lieutenant Lockford, who was having an affair with Danny's girl-friend 'Cats' Felton, a fact which Lockford's wife Claire has also discovered.br br Tom Ward - Dr. Harry Cunninghambr William Gaminara - Prof. Leo Daltonbr Emilia Fox - Dr. Nikki Alexanderbr Kieran Bew - Lt Stephen Lockfordbr Nathanael Baring - Danny Ferrisbr David Ajala - Mark Blakefieldbr Orion Lee - Dr. Oliver Matthewsbr Darren Morfitt - Sgt. Jason McDermottbr Theo Barklem-Biggs - Joseph Rylandbr Brendan Mackey - Dennis Croftbr Abigail Hardingham - Catherine 'Cats' Felton (as Abi Hardingham)br Michelle Fairley - DI Suzy Hartebr Phaldut Sharma - DS James Stern (as Paul Sharma)br Arsher Ali - Zak Khanbr Ralph Laurila - Ryan Axelbr Steve Nicolson - Major Julian Rutherfordbr Philip Whitchurch - Mr. Ferrisbr Emma Lowndes - Claire Lockfordbr Kirsty Mitchell - Lottie Jenkinsbr Alicya Eyo - Joanne McDermottbr Sarah Lowe - Nursebr Philip Whitchurch - Martin Ferrisbr Josette Simon - Mrs.