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Police Constable Flagg was a non-canonical character who was created for the film adaptation of Double Sin in Series 2 of ITV's Agatha Christie's Poirot. He was one of two policemen from Windermere who investigated Mary Durrant's reported loss of a set of valuable miniatures.

Police Constable Flagg was played by Gerard Holland. This character does not occur in the the original story.

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