| Clue | Source | Date |
|---|---|---|
| Trade union led by George Welch | The Telegraph Cross Atlantic | 05 Jul 2025 |
| Train drivers' union | The Telegraph Cross Atlantic | 06 Feb 2025 |
| Mick Lynch's trade union | The Telegraph Cross Atlantic | 15 Jan 2025 |
| The trade union led by Mick Lynch | The Times Specialist Sunday | 30 Oct 2022 |