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An exhibition at the Imperial War Museum Duxford is showcasing the role of aerial reconnaissance during World War Two. ‘Spies in the Skies: Second World War Aerial Reconnaissance’ tells the story of the Photographic Reconnaissance Unit (PRU) which operated far behind enemy lines in specialised aircraft. They would often fly unarmed, with their weapons swapped for high-performance cameras. The museum’s Liam Shaw tells Amir Suleman about their importance.