George Sewell Det. Chief Insp. Alan Craven Actor Roger Rowland Det. Sgt. North Actor Patrick Mower Det. Chief Insp. Tom Haggerty Actor Richard Butler Cmdr. Nichols Actor Sheila Scott-Wilkenson Pam Sloane Actor Gwen Watford Mrs Dolland Actor Richard Leech Actor Doreen Mantle Mrs Mitchell Actor Dinny Powell Actor Barry Jackson Actor Frank Barrie Actor Frank Jarvis Actor Bruce Montague Actor Malcom Terris Actor Pete Brady Actor Trevor Martin Bomb Disposal Officer Actor Bernard Archard Ministry Official Actor Ron Pember Actor Jenny McCracken Actor Michael Danvers-Walker Actor Mike Vardy Director Dennis Vance Director Roger Marshall Writer Trevor Preston Writer William Brayne Director Allan Scott Writer Peter Hill Writer Douglas Camfield Director John Kershaw Writer Chris Bryant Writer Ian Black Script Editor Lloyd Shirley Executive Producer George Taylor Executive Producer Geoffrey Gilbert Producer