| Final | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Daniel Belsey | 11 | Hemel Hemp | 46.36 |
| 2 | 2 | Hugo Raubitschek-Smith | 11 | Hatfield | 45.39 |
| 3 | 3 | Tom Dennis | 11 | Harpenden | 44.05 |
| 4 | 4 | George Prince | 11 | Hatfield | 43.46 |
| 5 | 5 | William Lockwood | 10 | Hatfield | 44.05 |
| 6 | 6 | Daniel Williams | 11 | Cheshunt | 45.15 |
| 7 | 7 | Alban Gill | 11 | Harpenden | 47.39 |
| 8 | 8 | Elliott Marshall | 11 | Watford SC | 46.82 |