Isabella Clarke has 3 recorded races from GB.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-04-12 | Schneider Electric Marathon de Paris 2026 — Marathon de Paris | Marathon | 5:06:08 | 50238 |
| TCS London Marathon 2025 | Marathon | 3:49:41 | 14300 | |
| TCS London Marathon 2023 | Marathon | 3:53:23 | 15599 |