The Wrong Arm of the Law (1963)

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.

Directed by: Cliff Owen

Starring: Peter Sellers, Lionel Jeffries, Bernard Cribbins, Nanette Newman, Davy Kaye, Bill Kerr

Links: IMDb, Movie posters, Movie stills