Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Lia Williams as Maggie Markham Georgia Taylor as Bella Summersbee Una Stubbs as Audrey Braylesford Simon Kunz as Miles Rattigan Kobna Holdbrook-Smith as Rob Mead Liberty Mills as Cecilie Petersen Ed Birch as Curtis Braylesford James Lance as Silas Raven Adam Kotz as Nick Summersbee Charlotte Cornwell as Jeannie Summersbee Howard Ward as Niall Colebrooke Timothy Watson as Vincent Treaborne Oona Kirsch as Suzie Colebrooke Grant Russell as George Summersbee
