Interstingly, Bletchly Park is known to have used crossword puzzles published in The Daily Telegraph as a recruitment tool for "codebreakers" during WWII. http

Interstingly, Bletchly Park is known to have used crossword puzzles published in The Daily Telegraph as a recruitment tool for "codebreakers" during WWII. https://en.wikipedia.org/wiki/Bletchley_Park#Personnel https://en.wikipedia.org/wiki/Bletchley_Park#Personnel