Guest Stars Fiona Dolman as Sarah Barnaby Annette Badland as Dr. Fleur Perkins Isabel Shaw as Betty Barnaby Aneurin Barnard as Freddie Lamb Bronagh Waugh as Blaise McQuinn Nicola Stephenson as Izzy Silvermane Eleanor Fanyinka as Jade-Marie Pierce Vincent Franklin as Artie Blythe Miles Jupp as Cornelius Tetbury Morgan Watkins as Griffin Twigg Lloyd Everitt as Harper Kaplan Paul Hunter as Gert Michaels John Stahl as Damian Lint Andrew Brooke as Lex Bedford Krupa Pattani as Simone Skye Chelsea Mather as Chelsea Nitin Ganatra as Ned Skye