Definition: In this task, five ordered key facts are given. All the given facts are expressed in natural language. Your job is to generate a story 100 to 1000 words long, that includes all the facts given as input in their order of appearance while expanding upon them to produce a broader, yet coherent, narrative.
Input: Fact1: gang of criminals from Australia led by Jack Coombes impersonate policemen to carry out robberies, Fact2: Local gang leader operates from cover of French couturier, Fact3: Sellers are both being scammed by same gang, Fact4: ubiquitous John Le Mesurier plays senior policeman, Fact5: young Michael Caine has small and uncredited role as young PC

In London, a gang of criminals from Australia led by Jack Coombes Bill Kerr impersonate policemen to carry out robberies. Local gang leader Pearly Gates Sellers, who operates from the cover of a French couturier, finds his takings cut severely, and blames rival crook Nervous OToole Bernard Cribbins. When it emerges that they are both being scammed by the same gang, they join forces, along with Lionel Jeffries Police Inspector Nosey Parker, to bring the socalled I.P.O. mob I.P.O.  Impersonating a Police Officer to justice. Nanette Newman provides the love interest, the ubiquitous John Le Mesurier plays a senior policeman, and a young Michael Caine has a small and uncredited role as a young PC. Other uncredited roles include John Junkin Maurice, Dennis Price Educated Ernest, Cardew Robinson Mailman, Dick Emery Man in Flat 307, Mario Fabrizi Van Driver, John Harvey Police Station Sergeant, Harold Siddons PC in Basement Garage, Jack Silk Police Station PC, Derek Guyler nonspeaking PC at Scotland Yard, Gerald Sim Airfield Official and Marianne Stone Woman in Front Row at Gangsters Meeting.