Guest Stars Nana Mensah as Billie Appiah Tim Delap as Byron Kenichiro Thomson as Martin Penny Downie as Frances Munning Adam Silver as Howard Pearl Mackie as Alysse Georgie Henley as Pensy Celia Imrie as Margaret "Meg" Roylin Graham Miller as Neil Barrow Sandy Amon-Schwartz as Sandy Bhav Joshi as Anu Kapoor David Bark-Jones as Alistair Kemper-Waithe Rupert Vansittart as Julian Hoope Adrienne Warren as Georgia Richard Huw as Portman Greg McKenzie as BBC Anchor Stella Talpo as White House Aide James Ashton as Lucas Ansko Pitkänen as Laurissa Safonova Grant Gillespie as Brian Sam Douglas as Lenkov David Alan Basche as Brad Chapman
