Jonathan Freedland compares the drive to attract more women into intelligence and cybersecurity today to the recruitment of women at Bletchley Park during World War Two. The government's National Cyber Security Centre - a branch of GCHQ - are keen to address the shortage of women in their workforce. Jonathan travels to Bletchley Park to look at what lessons can be learned from the wartime codebreaking operation where by the end of the war 75% of the workforce were female. Among Jonathan's guests is Charlotte Webb, who worked at Bletchley Park during the Second World War and is author of the book Secret Postings. Jonathan is also joined by Erica Munro, Exhibitions Manager at Bletchley Park; Jacqui Chard, Deputy Director for Defence & National Security at the National Cyber Security Centre; Elisabeth Braw of the Royal United Services Institute; and Jane Frankland, Cyber Security Consultant. Producer: Laurence Grissell