Title: I Was Monty's Double (film)
Content:  I Was Monty's Double (aka Hell, Heaven or Hoboken) is a 1958 film made by Associated British Picture Corporation (ABPC). It was directed by John Guillermin. The screenplay was adapted by Bryan Forbes from the autobiography of M. E. Clifton James, an actor who pretended to be General Montgomery as a decoy during the Second World War.
Title: I Was Monty's Double (film)
Content:  In mid June it was announced that Clifton James would play himself and Montgomery, with Olivier the leading choice for the other main role. Permission from Montgomery and the War Office was conditional upon script approval. A deal was signed with Columbia to distribute. In August 1956 the film was listed on Todon's slate which also included Town on Trial, directed by John Guillermin and starring John Mills, who would make Monty's Double. Other films to be made included The Long Haul. In September Michael Rennie was mentioned as a lead. In July 1957 it was announced Ken Hughes would direct. Producer Maxwell Setton took the film for 
Title: I Was Monty's Double (film)
Content:  The film was a success at the British box office. James went on a tour to promote the film. Variety described it as "excellently acted and directed....the film has several moments of real tension. Even with a somewhat fictionalized ending, there is a documentary flavor about it which is absorbing. Plenty of-news footage has been woven into the pic and it has been done with commendable ingenuity. Bryan Forbes’ taut screenplay is liberally spiced with humor...James shows himself to be a resourceful actor in his own right... An extraordinary story told convincingly and compellingly." Film reviewer Stephen Vagg wrote that the film was "splendidly entertaining. The script was written by thespian-turned-scribe Bryan Forbes, and there’s some lovely "actor" character stuff in the film, eg. James thinking he’s being hired for a film role and bringing along a scrapbook of his reviews, James having last-minute nerves, James getting up on stage and worrying about blowing it." Stephen Watts, who was involved in the operation, thought James "played himself with great skill and distinction." When Montgomery saw the film at a London cinema, audiences outside reportedly assumed he was Clifton James.
Title: I Was Monty's Double (film)
Content: M. E. Clifton James as himself and General Montgomery ; John Mills as Major Harvey ; Cecil Parker as Colonel E. F. Logan ; Patrick Allen as Colonel Mathers ; Patrick Holt as Colonel Dawson ; Leslie Phillips as Major Tennant ; Michael Hordern as Governor of Gibraltar ; Marius Goring as Karl Nielson ; Barbara Hicks as Hester Baring ; Duncan Lamont as Wing Commander Bates ; Anthony Sagar as Guard Sergeant ; John Gale as Flight Lieutenant Osborne ; Kenneth J. Warren as Flying Officer Davies ; James Hayter as Sergeant Adams ; Sid James as Desk Clerk Y.M.C.A. ; MacDonald Parke as American General ; John Le Mesurier as disgruntled officer ; Vera Day as Angela ; George Eugeniou as Garcia ; Patrick Connor as Soldier in Tent (uncredited) ; Sam Kydd as Soldier in Cinema ; Alfie Bass as man on train ; Allan Cuthbertson as Guards Officer 
Title: I Was Monty's Double (film)
Content:  I Was Monty's Double inspired a Goon Show episode entitled "I was Monty's Treble", referring to at least 3 doppelgangers. The film was also spoofed in the comedy film On the Double, with Danny Kaye playing a double role. The Private Eye comic strip, Battle for Britain was penned by Ian Hislop under the nom-de-plume Monty Stubble. When the comic strip ended, after the 1987 General Election and Stubble's death, his gravestone was shown to bear the inscription "I was Monty Stubble".
Title: I Was Monty's Double (film)
Content: James, M. E. Clifton. I Was Monty's Double. London: Rider and Co., 1954. ISBN: 978-0-34320-691-8. ; MacIntyre, Ben. "Monty's boozy Aussie double fooled Nazi spy." The Australian, 13 March 2010. ; Swainson, Leslie "No Clash of Arms in War Film." The Age, Melbourne, 27 August 1957. 
Title: I Was Monty's Double
Content: The Goon Show broadcast a parody episode entitled I Was Monty's Treble on 10 November 1958 (9th series, show 2). ; In 1959, Cecil Parker and Leslie Phillips appeared in a spoof version, The Night We Dropped a Clanger (known as Make Mine a Double in the U.S.), alongside Brian Rix. ; The 1961 film On the Double, starring Danny Kaye, was also a take-off of I Was Monty's Double, in which Kaye plays the twin roles of the General and the private who (comically but successfully) impersonates him. ; The 1989 Jason Connery film Casablanca Express freely borrows from the original tale, but with Churchill as the kidnap target. Glenn Ford appears briefly as a character resembling Gen. Williams. 
Title: I Was Monty's Double
Content:  I Was Monty's Double (released in the US as The Counterfeit General Montgomery ) is a book by M. E. Clifton James, first published in London in 1954. It was made into a film in 1958, directed by John Guillermin, from a screenplay adapted by Bryan Forbes. It tells the story of Operation Copperhead: James had an uncanny resemblance to General Montgomery in real life, and he was used to impersonate Montgomery to confuse the Germans during the Second World War.
Title: M. E. Clifton James
Content:  In 1947 James had made a brief (non-speaking and uncredited) appearance as an extra in the film Holiday Camp as a holidaymaker in the dance floor scene along with Jack Warner and Kathleen Harrison. In 1954, James published his exploits in a book entitled I Was Monty's Double (released in the US as The Counterfeit General Montgomery ). The book became the basis for the script of the 1958 film starring John Mills and Cecil Parker with James playing himself and Montgomery. The script was "tweaked" for effect; "Operation Copperhead" became "Operation Hambone", and additional elements of comedy, danger and intrigue 
Title: I Was Monty's Double (film)
Content:  who agreed to finance, but Sir John Davis, head of Rank, wanted Bryan Forbes' script vetted by head of production Earl St. John. Setton then took the project to Robert Clark at ABPC, who agreed to finance. Setton had to change the nationality of Marius Goring's spy character from Spanish to Swedish to enable the unit to film in Gibaltar. Newsreel footage puts the real Field Marshal Montgomery in many scenes, but "for a few key moments, James stands in for the real Monty." In January 1959 Associated British signed a deal with NTA for them to distribute this and Ice Cold in Alex in the US.

Question: Who was the screenwriter for I Was Monty's Double?
Answer: Bryan Forbes.