The Wrong Arm of the Law

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.

• 
  Cliff Owen

• 
  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
• 
  Dermot Kelly
  Misery Martin
• 
  Vanda Godsell
  Annette
• 
  Barry Keegan
  Alf
• 
  Marianne Stone
  Woman at Meeting (uncredited)
• 
  Michael Caine
  Police Officer (uncredited)
• 
  Dennis Price
  Educated Ernest (uncredited)