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The film starred Dean Jagger, Edward Chapman and Leo McKern.

It was written by Jimmy Sangster, and was originally to have been directed by Joseph Losey ( working under the name Joseph Walton ).

Losey was an American director who had moved to the UK after being placed on the Hollywood blacklist.

Although Losey did begin shooting the film and some of his footage is included in the final cut, when Dean Jagger arrived on set the star refused to work with a suspected Communist sympathiser.

Losey was replaced by Leslie Norman, officially for health reasons.