

17/03/1963
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.

Peter Sellers
as Pearly Gates

Lionel Jeffries
as Inspector Fred 'Nosey' Parker

Bernard Cribbins
as Nervous O'Toole

Nanette Newman
as Valerie

Davy Kaye
as Trainer King

Bill Kerr
as Jack Coombes

Ed Devereaux
as Bluey May

Reg Lye
as Reg Denton

John Le Mesurier
as Assistant Commissioner

Graham Stark
as Sid Cooper

Martin Boddey
as Superintendent J.S. Forest

Irene Browne
as Dowager

Arthur Mullard
as Brassknuckles

Tutte Lemkow
as Siggy Schmoltz

Dermot Kelly
as Misery Martin

Vanda Godsell
as Annette

Barry Keegan
as Alf

Marianne Stone
as Woman at Meeting (uncredited)

Michael Caine
as Police Officer (uncredited)

Dennis Price
as Educated Ernest (uncredited)

Dick Emery
as Adulterous Man (uncredited)

John Junkin
as Maurice (uncredited)

Cardew Robinson
as Postman (uncredited)

Mario Fabrizi
as Van Driver (uncredited)

John Harvey
as Sergeant at Police Station (uncredited)

Harold Siddons
as Police Constable in Garage (uncredited)

Jack Silk
as Police Constable at Station (uncredited)

Deryck Guyler
as Police Constable at Scotland Yard (uncredited)

Gerald Sim
as Airport Official (uncredited)
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