Meet a man who solved GCHQ's Christmas puzzle

Name: Meet a man who solved GCHQ's Christmas puzzle
Uploaded: 2016-02-04T23:05:23.000Z
Duration: 2 min 14 s
Description: Thousands of people have tried to solve a puzzle sent out in a Christmas card from the head of GCHQ, Britain's code-breaking intelligence agency.

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Thousands of people have tried to solve a puzzle sent out in a Christmas card from the head of GCHQ, Britain's code-breaking intelligence agency.

Three people have been chosen as winners, as Gordon Corera reports.

4 February 2016