| Clue | Source | Date |
|---|---|---|
| Cracking experts? (4,8) | ||
| Bletchley Park workers (1939-46) such as Alan Turing | The Times Specialist Sunday | 02 Mar 2025 |
| Eg, GCHQ staff | The Times Concise | 27 Dec 2021 |
| Bletchley Park analysts | LA Times Daily | 10 Jun 2018 |
| Bletchley Park analysts | The Washington Post | 10 Jun 2018 |
| Bletchley Park analysts | ||
| Charlie's poem on waves is crackers |