Karl Hamilton has 6 recorded races from GB.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2023-04-02 | Schneider Electric Marathon de Paris 2023 — Running 42.195km | Marathon | 3:29:00 | 9759 |
| BMW Berlin Marathon 2025 | Marathon | 3:17:00 | 4280 | |
| TCS London Marathon 2022 | Marathon | 3:55:28 | 11401 |