The rebuilt Colossus codebreaker in action

Computer expert and former spy Tony Sale demonstrates how a rebuilt version of the WWII codebreaking computer works

Bletchley Park was the secret home to Britain's top codebreakers during World War II.

The base is now home to the fledgling National Museum of Computing, which features a rebuild of the world's first electronic codebreaking computer, Colossus.

The man who rebuilt Colossus, computer expert and former spy Tony Sale, here demonstrates how the machine works.

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