Guest Stars Anthony Calf as Deputy Assistant Commissioner Robert Strickland Susan Jameson as Esther Lane Natalie Forbes as Jayne Carolyn Allen as Carole Heather James as Alison David Troughton as Ricky Hanson Noma Dumezweni as Sophie Oyekambi John Sessions as Dr. Finlay McKenzie Lynda Bellingham as DS Karen Hardwick MEREDITH BRAUN as Nyreen Marian McLoughlin as Shirley White Mark Womack as Ray Monkton Nick Haverson as Norman Simon Dutton as Duncan Freedman