Anne-Marie Duff Susannah Actor Celine Buckens Sapphire Actor Dominic Cooper Jon Actor Eddie Marsan Dr Alistair Underwood Actor Ben Miller Richard Actor Vinette Robinson Louisa Actor Tamsin Greig Natasha Actor Nicholas Pinnock Joseph Buckley Actor Gina McKee Kate Actor Liam Smith Clive Actor Kamilla Steczkowska Escort Actor Ricky Champ Carter Actor Noel Baffoe Sergeant Barman Actor Walter Iuzzolino Executive Producer Jo McGrath Executive Producer Joy Wilkinson Writer Carolina Giammetta Director, Executive Producer Dries Vos Executive Producer Dylan Rees Producer David Allison Writer