Guest Stars Steve Knowles as Gordon Drew Michael Bertenshaw as PC Vaughan Paul Nicholson as William Webster George Russo as Billy Faraday Cherith Mellor as Liz Adams Patrick O'Connell as James White Tony Stephens as Scientific Services Officer Stella Tanner as Joan Cooper Julie Neubert as Gloria Webster Jack Carr as Harry Taylor Alex Dower as Paul Johnson George Sweeney as Ted Faraday Cliff Howells as George Tandy Annie Hayes as Betty Faraday Vicky Murdock as Alison Cooper Peter McNamara as Terry Cooper Peter Armitage as Peter Adams Alwyne Taylor as Jo Tandy