Guest Stars Grace Hogg-Robinson as Tess Marshall Joshua Hogan as Barney Marshall Ellie Kendrick as Stephanie Lodge Emmanuel Imani as James Odubajo Con O'Neill as Harry Rowntree Mark Bazeley as Sam Marshall Max Parker as John Cripps Molly McGlynn as Jane Allum Pearce Quigley as Nick Dunbar Katherine Jack as Cressida McGuire Denise Moreno as Isabella Yemisi Oyinloye as Eloise Porter Laura Meredith as University Student Zar Damani as Kemal Hussain Inmaya Ali as Kemal's Daughter Kel Allen as Water Distributor Chris Taberner as Protection Patrol Man Natasha Ferguson as PC Sarah Jarvis Arabella Arnott voices Radio Presenter Charlotte Baker as Woman in Crowd Hannah Barrie as Woman in Queue