Leonard Dawe, Telegraph crossword compiler, created these puzzles at his home in Leatherhead.
Tweedsmuir, the son of author John Buchan, later commented: "We noticed that the crossword contained the word "Dieppe", and there was an immediate and exhaustive inquiry which also involved MI5.
[2] That induced Ronald French, then a property manager in Wolverhampton, to come forward to say that in 1944, when he was a 14-year-old at the Strand School, he inserted D-Day codenames into crosswords.
Written by David Reid and directed by Moira Armstrong, it starred Michael Gough as Mr Maggs, a school headmaster based on Dawe.
Another fictionalised version appeared in the Norwegian children's book Kodeord Overlord (Codeword Overlord), written by Tor Arve Røssland and published by Vigmostad&Bjørke publishing house in 2019, whose main character is also based on Dawe.