"Part Two: One Mile Down", Part 6 by Jenny T Colgan , Roy Gill , James Goss , David Tennant , Catherine Tate , Helen Goldwyn , Eleanor Crooks , Robert Whitelock , Theo Stevenson , Stephen Critchlow , Lauren Cornelius , Rakie Ayola , Jacqueline King , Peter Singh , Bernard Cribbins , Christopher Naylor , Kieran Bew , Joel Fry & Nicholas Briggs