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The working titles of this film were Britannia Mews and Impulse. The film was released in Great Britain as Britannia Mews and was originally scheduled to be released in America as Affairs of Adelaide. According to documents in the Twentieth Century-Fox Records of the Legal Department at the UCLA Arts-Special Collections Library, the studio bought Margery Sharp's novel in June 1946 for $150,000 plus bonus increments. A Hollywood Reporter news item of June 19, 1946 announced that Gene Tierney and Rex Harrison would star in The Forbidden Street. British publicity materials and the Variety review include Neil North and Anthony Lambin in the cast, but they were not in the viewed print, and it is possible that their scene was cut from the final film. The film was shot in England using studio funds frozen in Great Britain.
An early draft of the screenplay was written by David Hertz, but his contribution to the final film has not been confirmed. A Variety news item of November 30, 1948 reported that the studio had "two entirely different versions of The Affairs of Adelaide and doesn't know which to use. Situation came to light with the arrival here of Richard Best, British film cutter hired to sit in on editing of the British-made film. Best had already cut one version, in England. The almost completed studio version was altogether different than his, which he brought along with him. Studio paid Best's fare over, in order to insure proper overseas 'touches' in Adelaide." Veteran Fox film editor Robert Simpson did some work on the American version, according to the legal records, but waived screen credit. Neither Simpson nor Best received screen credit on The Forbidden Street, however. According to modern sources, Dana Andrews' performance as "Henry Lambert" was dubbed by an unidentified British actor.