The Queen is to pay tribute to the codebreakers who worked at Bletchley Park, the secret cypher base in WWII which broke the German Enigma codes. She will visit the site in Milton Keynes with Prince Philip, and unveil a memorial to the men and women who worked there.

Some historians estimate that breakthroughs made there shortened the war by two years. Some of the surviving codebreakers will be present for the event. Though the role codebreaking played in the war is now widely celebrated in films such as Enigma, for 30 years after the end of the war Bletchley Park's role remained a secret.

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