Jessica Raine Jenny Lee Actor Jenny Agutter Sister Julienne Actor Pam Ferris Sister Evangelina Actor Judy Parfitt Sister Monica Joan Actor Helen George Trixie Franklin Actor Bryony Hannah Cynthia Miller Actor Miranda Hart Chummy Browne Actor Vanessa Redgrave Mature Jenny (voice) Guest Star Victoria Yeates Sister Winifred Guest Star Emerald Fennell Patsy Mount Guest Star Cliff Parisi Fred Buckle Guest Star Jack Ashton Tom Hereward Guest Star Ben Caplan PC Peter Noakes Guest Star Laura Main Shelagh Turner Guest Star Amy Molloy Phoebe Doyle Guest Star Killian Scott Declan Doyle Guest Star Hugh Warren Producer Heidi Thomas Writer China Moo-Young Director Damian Wayling Writer