Bletchley Park code-breakers reunited [audio 45min]

Presenter Sue MacGregor gathers together five Bletchley Park code-breakers intimately involved in the decryption of German messages created by the complex Enigma machine during World War II. Their success, on an unprecedented scale and against enormous odds, is said to have shortened the war by two years, but ther nature of their work remained a secret for more than three decades.