GCHQ

abbreviation for

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The full challenge can be viewed on GCHQ's website here.

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GCHQ's annual brainteaser comes in the form of the agency's Christmas card, sent by the intelligence organisation's director Anne Keast-Butler.

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GCHQ's Chief Puzzler, known only as "Colin", described this year's tests as "fiendishly enjoyable".

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The full challenge can be viewed below or on GCHQ's website.

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He held roles in the UK's intelligence agency, GCHQ, and in the Royal Household on the way to the top job.

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