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