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In recent years, Hollywood blockbusters have shone a light on the male heroes of Bletchley Park, who have been credited with shortening the Second World War by many months. However, if you walked through the gates of the codebreaking centre seventy years ago, you would have been struck not by the number of men working there but the number of young women. That's because by 1944 three quarters of Bletchley's workforce was made up of very young women, or girls, often just out of school. Tessa Dunlop speaks to some of those Bletchley girls, now in their late 80s and 90s, about their stories. First broadcast on The Bletchley Girls, 22 July 2015.