Guest Stars Fiona Dolman as Sarah Barnaby Annette Badland as Dr. Fleur Perkins Hannah Waddingham as Mimi Dagmar Keith Allen as Harry Marx John Thomson as Cooper Steinem Peter de Jersey as Toby Wagner Jacob Fortune-Lloyd as Gideon Tooms Nimmy March as Julia Steinem Harriet Thorpe as Georgie Tremayne Natalie Simpson as Erika Marx Lizzy McInnerny as Alberta Tooms Michael Nardone as Mack McInally Silas Carson as Rueben Tooms Sirine Saba as Jocasta Farthing
