Guest Stars Tony Robinson as Roger Smith John Boswall as Professor Humber Judi Spiers as Television Presenter Debbie Arnold as Mrs. Bingham Ron Donachie as Police Doctor Richard Coleman as Chief Inspector Trusscott Marcia Warren as Annie Smith Beverley Walding as Receptionist Hywel Bennett as Harold Bingham Charles Pemberton as Police Constable Louise Beattie as Amanda Dora Bryan as Mrs. Mim Neale McGrath as Shop-Keeper
