Guest Stars David McKail as Dr. Mackenzie Paul Moriarty as Sgt. Bill Wells Caroline Harker as WPC Hazel Wallace Bill Stewart as Sandy Longford Stuart Barren as Sgt. Johnnie Johnson Bill Rourke as Sgt. Hanlon Jon Sotherton as DC Mark Howard Ian Driver as DC Jordan Neil Phillips as DCI Jim Allen Christopher Rickwood as PC Stringer David Killick as Pathologist Vincent Regan as PC Shelby Ben Daniels as Roger Massie Jane Hazlegrove as Maureen Shelby Rowena King as Julia King Sue Johnston as Phyllis Bowman Caroline Paterson as Diana Webster Dominique Barnes as Sophie George Anton as DC Webster Norma West as Stella Massie Douglas McFerran as Ronnie Eustace Tony Armatrading as Leslie Russell