The Duchess of Cambridge donned a pair of headphones and tried to interpret codes during her visit to Bletchley Park where her grandmother worked.
Valerie Glassborow worked as a civilian member of staff, probably as a duty officer, alongside her twin sister Mary.
Wearing an Alexander McQueen outfit, Kate greeted staff on a visit to mark a year-long restoration project at the Buckinghamshire site.
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Taken in the White Drawing Room at Windsor Castle, a new photograph marks the couple's 70th wedding anniversary.
The 69-year-old republic veteran told the annual Sinn Fein Ard Fheis it would be his last as leader.
A body has been found in the search for missing teenager Gaia Pope.