Bletchley Park code-breakers' reunion
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WWII code-breakers reunite at Bletchley Park

3 September 2012 Last updated at 15:00 BST

Some of the code-breakers whose work helped to change the course of World War II have returned to Bletchley Park for their annual reunion.

The first of the code-breakers arrived 73 years ago as the outcome of the war hung in the balance.