Kate, the Duchess of Cambridge, has travelled to the old home of Britain's World War Two codebreakers, where her own grandmother worked, to visit an exhibition marking the 75th anniversary of the D-Day landings in Normandy.
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The historic site in Milton Keynes is where mathematician Alan Turing cracked Nazi Germany's "unbreakable" Enigma code.
D-Day: Interception, Intelligence, Invasion, held in the Teleprinter Building where codebreakers worked on intercepted messages, features an immersive film, shown on a giant curved screen, based on newly declassified information showing how Bletchley Park helped in the planning of the allied landings in France on June 6, 1944.
Kate was shown a new memorial wall which contained the names of those who were veterans of the war who served at Bletchley Park.
The wall contained commemorative bricks, featuring the names of her grandmother, Valerie Glassborow, and her twin sister, Mary, who both worked at the code-breaking facility during the war.
While on her tour of the base, the Duchess also took part in the code-breaking exercises with children from Ackley Wood School in Buckinghamshire.
She helped the children de-scramble German messages, like those during the war, using an original Enigma code-breaking machine, and deciphered the message: "The invasion has begun."
Speaking about her family connection with Bletchley Park, the Duchess told the children: "My Granny and her sister worked here which is really cool.
"She was sworn to secrecy and she found it very difficult to talk about."
After helping the children, Kate was presented with owl, squirrel, rabbit and fox stuffed toys to give to her nephew Archie, the newborn son of the Duke and Duchess of Sussex.
Australian Associated Press