Guest Stars Nicola Sanderson as SOCO Joy Ackroyd Adelayo Adedayo as Kayla Cyril Nri as Judge DeMarco Ramon Tikaram as Vijay Prasad Carolyn Pickles as Maureen Riley Holly Earl as Lisa Gardner Mark Frost as Dr. Philip Gardner Hattie Morahan as Alison Gardner Antonia Clarke as Anna Sands Ted Reilly as Paul Downing Scarlett Milburn-Smith as Heather Downing Jude White as Riley Gardner Emma Davies as Mary Sands Damian Kell as William Farmer Clive Hayward as Jonathan Shale Mandana Jones as Dr. Antonia Carey Greg Patmore as Barry Downing Uncredited Robert Glenister voices Opening Narration