Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Clare Calbraith as Catrina Harper Ace Bhatti as Harry Dutta Maureen Lipman as Margaret "Mags" Dormer Kelly Price as Tanya Walker Kenny Ireland as George Dormer Barnaby Kay as Adrian Sharp Charles Daish as Jack Clough Harry Hadden-Paton as Lawrence Janson Jay Taylor as Peter Groves Soraya Radford as Gagan Dutta Tim Wallers as Jeremy Harper Uncredited Shaun Lucas as Torch Bearer