Guest Stars Grace Hogg-Robinson as Tess Marshall Joshua Hogan as Barney Marshall Ellie Kendrick as Stephanie Lodge Emmanuel Imani as James Odubajo Max Parker as John Cripps Molly McGlynn as Jane Allum Pearce Quigley as Nick Dunbar Sam Crane as Dominic Knight Yemisi Oyinloye as Eloise Porter Denise Moreno as Isabella Ruby Barker as Georgia Nixon Caroline Hayes as Minister for Business Vera Chok as Maria (Air Traffic Controller)