For many years William was unaware of his father's important work at the Bletchley Park WWII codebreaking centre because it was protected under the Official Secrets Act until at least in the mid-1970s. Nevertheless, Alan Turing was a firm family friend, as was Albert Einstein, and a Monopoly board devised by William with Turing in 1950 was retrieved in 2011 following a visit to his family home with his son, daughter and future daughter-in-law, and later repackaged and sold by Bletchley Park.
