Pigeon historian Colin Hill outside the Bletchley Park pigeon lofts
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The secret world of the Bletchley Park pigeon spies

The BBC's security correspondent Gordon Corera and Today programme guest editor, the former MI5 chief Dame Eliza Manningham-Buller uncover the secret history of Britain's pigeon spies, and the role played by her own mother, during World War Two.

  • 27 Dec 2013