Guest Stars Nana Mensah as Billie Appiah Tim Delap as Byron Kenichiro Thomson as Martin Adam Silver as Howard Pearl Mackie as Alysse Celia Imrie as Margaret "Meg" Roylin Graham Miller as Neil Barrow Sandy Amon-Schwartz as Sandy Bhav Joshi as Anu Kapoor Elijah Isaiah Cook as Theo (CIA Officer) Simon Hepworth as Randall Clare Burt as Jemma Doud Adrienne Warren as Georgia Gordon Kennedy as Marcus John Macneill as Phelan Jonathan Watson as Paul Lauren Davidson as Inveraray Store Clerk
