The movie was shot entirely on location in early 1967 and contains much period footage of central London, including shots of Marble Arch, Trafalgar Square, Little Venice and Kensal Green. Shots of the gang meeting up prior to the robbery were filmed at Leyton Orient Football Club during a match with Swindon Town. The gang's airfield hideout was filmed at RAF Graveley. Filming was even done at New York Harbour and Arbour Hill Prison in Dublin. The robbery itself was shot to the east of Theddingworth.