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Portions of the film were shot on location in Brighton and Sheepscote, England. When the film opened in London in April 1969, it's running time was 144 minutes. Len Deighton, who was originally a co-producer for the film, requested that he not be given screen credit. Jack Hawkins' voice was dubbed in the film, as the actor had lost his voice due to surgery for throat cancer in 1966.