According to ibtimes.com.au:
Kate Middleton’s grandmother was a code-cracker for Britain who helped foil Adolf Hitler. The Duchess of Cambridge has paid tribute to Valerie Glassborow, who was one of the many young women who worked at the Bletchley Park code-breaking station during World War II.
“I have always been immensely proud of my grandmother, Valerie Glassborow, who worked at Bletchley Park during the Second World War. She and her twin sister, Mary, served with thousands of other young women as part of the great Allied effort to break enemy codes. They hardly ever talked about their wartime service, but we now know just how important the men and women of Bletchley Park were, as they tackled some of the hardest problems facing the country,” the Duchess wrote the foreword of the book.
