The Duchess of Cambridge was sent signals similar to those sent out by the enemy and interpreted at 'spy school' Bletchley Park during the Second World War.
Her grandmother Valerie Glassborow worked at the famous site as a civilian member of staff, probably a duty officer, with her twin sister Mary.
Kate's visit marked a year-long restoration project at the Buckinghamshire site.
More top news
Amid talk of prisoner exchange, it's worth bearing in mind that IS militants have never explicitly said they're ready to release hostages.
Widower Stan Beaton couldn't believe it when Virgin trawled through thousands of messages to find one left by his wife Ruby 14 years ago.
A head chef lost more than half his 36st body weight thanks to tough love from a friend who called him a fat f***" every day for six weeks.