Mathematician Bobby Seagull described the coin as ‘an invitation to a nationwide intellectual adventure’ (Royal Mint/Casey Gutteridge/PA) A coin will form part of a nationwide code-breaking challenge, ...

Did you know with a Plus subscription to Shropshire Star you get full access to our award winning journalism for the news that matters to you and more. The £5 denomination coin includes numbers, ...

A coin will form part of a nationwide code-breaking challenge, with the eventual chance for competition entrants to win a gold bar. The £5 denomination coin includes numbers, letters, and symbols that ...

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