Guest Stars James McKenna as Sgt. Don Brady David McKail as Dr. Mackenzie Barry Jackson as Walter Peters Kate Maberly as Melanie Monkton Jason Merrells as Mike Patterson Michael Cochrane as Babcock, HMI James Flynn as Paul Mathews Ben McCosker as Steve Nesbit Annette Ekblom as Fiona Monkton Susan Penhaligon as Pam Hartley Julian Wadham as Harry Monkton Michelle Joseph as WPC Ronnie Lonnegan Barrie Ingham as Arnold Harris Jonjo O'Neill as Jeffrey Meadows Muriel Barker as Evelyn Post Joanna Bacon as Tessa Meadows Michael Bertenshaw as Tony Chalmers Joanne Allen as Susan Talbot Liam Noble as Lionel Grange Elliot Young as Billy Simpson