A sealed package containing heroin was found in an 80-year-old Foreign Office file at the National Archives, its managers have said. The Class A drug was filed with a document from the British Consulate in Cairo about a 1928 court case.

The off-white powder, discovered by a member of the public who asked to see the file, was sent for analysis. And having been confirmed as heroin, the substance was handed over to the Metropolitan Police.

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