Guest Stars Tom Price as Andy Davidson Cush Jumbo as Lois Habiba Peter Capaldi as John Frobisher Katy Wix as Rhiannon Davies Lucy Cohu as Alice Carter Luke Perry as David Davies Nicholas Farrell as Brian Green Ian Gelder as Mr Dekker Susan Brown as Bridget Spears Julia Joyce as Holly Frobisher Liz May Brice as Johnson Madeleine Rakic-Platt as Lilly Frobisher Hilary MacLean as Anna Frobisher Aimee Davies as Mica Davies Rhodri Lewis as Johnny Davies Bear McCausland as Steven Carter Louise Minchin as Newsreader Paul Copley as Clemet McDonald Simon Poland voices 456 Gregory Ferguson as Young Clem Fay McDonald as Mother Robert Shelly as Sentry Ashley Hunt as Recovery Worker Libby Liburd as Barmaid Quill Roberts as Guard Osi Okerafor as Kodak Emmanuel Ighodaro as Paramedic