William Nunn has 5 recorded races from GB.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2024-04-07 | Schneider Electric Marathon de Paris 2024 — Marathon de Paris 2024 | Marathon | 3:02:52 | 2507 |
| TCS London Marathon 2026 | Marathon | 2:47:40 | 1356 | |
| TCS London Marathon 2025 | Marathon | 4:37:22 | 29431 | |
| TCS London Marathon 2023 | Marathon | 3:14:23 | 5179 |