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 Twinkle Jaiswal as Katherine Saskia Kemkers as Emily Lake Imali Perera as Miss Potts