Guest Stars Natasha Raphael as Irene Edwards Beth Bradfield as Jean Dunlop Imogen Lamb as Mary-Lou Linnett Ashley McGuire as Matron Jennifer Wigmore as Miss Grayling Genevieve Beaudet as Mam'zelle Rougier Minti Gorne as Felicity Rivers Saskia Kemkers as Emily Lake Twinkle Jaiswal as Katherine Imali Perera as Miss Potts Hannah Saxby as Pamela Naomi Sheldon as Mrs. Lacey Rob Carter as Mr. Rivers Flora Dawson as Mrs Rivers