Page last updated at 00:52 GMT, Thursday, 24 July 2008 01:52 UK

Inside Bletchley Park

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A new exhibition called 'Real Spies' has opened at Bletchley Park National Codes Centre.

Meanwhile leading computer scientists are warning that the site is under threat and should be treated as a national museum.

The BBC's Rory Cellan-Jones takes a look around.

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