Jason Smallman has 5 recorded races from GB.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-04-12 | Schneider Electric Marathon de Paris 2026 — Marathon de Paris | Marathon | 3:14:04 | 4930 |
| 2025-04-13 | Schneider Electric Marathon de Paris 2025 — Schneider Electric Marathon de Paris | Marathon | 3:22:14 | 6351 |
| BMW Berlin Marathon 2025 | Marathon | 3:18:33 | 4521 |