Summary
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.
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Cast
Peter Sellers
Pearly Gates
Lionel Jeffries
Inspector Fred 'Nosey' Parker
Bernard Cribbins
Nervous O'Toole
Nanette Newman
Valerie
Davy Kaye
Trainer King
Bill Kerr
Jack Coombes
Ed Devereaux
Bluey May
Reg Lye
Reg Denton
John Le Mesurier
Assistant Commissioner
Graham Stark
Sid Cooper
Martin Boddey
Superintendent J.S. Forest
Irene Browne
Dowager
Arthur Mullard
Brassknuckles
Tutte Lemkow
Siggy Schmoltz
Vanda Godsell
Annette
Marianne Stone
Woman at Meeting (uncredited)
Michael Caine
Police Officer (uncredited)
Dennis Price
Educated Ernest (uncredited)
Dick Emery
Adulterous Man (uncredited)
John Junkin
Maurice (uncredited)
Cardew Robinson
Postman (uncredited)
Mario Fabrizi
Van Driver (uncredited)
John Harvey
Sergeant at Police Station (uncredited)
Deryck Guyler
Police Constable at Scotland Yard (uncredited)
Gerald Sim
Airport Official (uncredited)