A criminal mastermind joins forces with Scotland Yard and the best of Britain's crime bosses to stop a gang of Australian crooks disguised as policemen from taking over the London underworld. Comedy, starring Peter Sellers, Lionel Jeffries, Nanette Newman, Bernard Cribbins, Dennis Price and John Le Mesurier. Including FYI Daily.

The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upsets the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armoured car robbery in which the police must help the gangs to set a trap.