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