The Secret Crossword

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Across
  1. 1. The Prime Minister
  2. 4. Sir Herbert Leon's house
  3. 5. Retrieved from a U-boat
  4. 8. Number of cogs on first Enigma machine
  5. 9. U-boat animals
  6. 11. Time from for Bletchley Park codebreakers
  7. 12. Ethos of Bletchley Park
  8. 14. Famous codebreaker
  9. 15. Name of WAAF quarters
  10. 18. Puzzles used to recruit codebreakers
  11. 19. Problem for codemakers
Down
  1. 1. Problem solver
  2. 2. Game used to identify codebreakers
  3. 3. Turing's profession
  4. 6. Puzzling machine
  5. 7. GPO man who built Colossus
  6. 10. Codename for Bletchley Park
  7. 12. A characteristic of Alan Turing
  8. 13. Wartime signals intelligence codename
  9. 16. Alan Turing's first programmable computer
  10. 17. Allies at Bletchley