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