Can you crack the GCHQ Christmas card code?

This year’s festive brainteaser has been specially designed for ages 11-18

Person on the computer, with a confused expression
(Image credit: Unsplash)

Just as Brits across the UK are wrestling with the complexities of new Covid-19 restrictions, GCHQ – the nation’s intelligence and security organisation – has sent another head-scratcher our way.

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