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