Women played a huge role in the work that went on to crack the Enigma machine at Bletchley Park
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This year is the 100th anniversary of GCHQ, once called the Government Code and Cipher School (GC&CS) and the brainchild behind one of World War II’s most famous institutions: Bletchley Park in Buckinghamshire.
LEFT: Keira Knightly stars in The Imitation Game as Joan Clarke, a rare female codebreaker