Guest Stars Philippa Urquhart as Susan Oliver Ford Davies as Dept. Assist. Commissioner Gradley John Golightly as Det. Insp. Howitt Pete Postlethwaite as Jack Frost Mike Savage as Sgt. Hissink Ian Brimble as Reg Grey Tommy Wright as Straub Carole Bollard as W.P.C. Wilkins Patrick Moore as Garfield Jill Simcox as Miss Russell Stephen Lawrence as Det. Sgt. Hunt Judith Bruce as Babs Raymond Brody as Franco Terence Budd as P.C. Lyall David Gillies as P.C. Thomas Jean Leppard as Jean Grey Uncredited Norman Hartley as Commissionaire
