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Helen Fry talks about an ingenious British intelligence operation to bug German prisoners during the Second World War

Podcast Website Large Helen Fry - WWII Intelligence

Author and historian Helen Fry talks about her new book, The Walls Have Ears, which describes an ingenious British intelligence operation to bug German prisoners during the Second World War

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An engraving depicting London's Piccadilly Circus heaving with crowds on their way to The Great Exhibition of 1851. A banner reading 'God save the Queen and Prince Albert' has been strung across the street. Within the Crystal Palace some 100,000 objects were displayed – taking up ten miles of space – the work of 15,000 contributors. (Photo by Rischgitz/Getty Images)
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