| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Summer Lancefield | 10 | Northampton | 53.48 |
| 2 | 2 | Eliza Groom | 11 | Corby | 53.02 |
| 3 | 3 | Lily Muir | 10 | Rushden | 52.03 |
| 4 | 4 | Savannah Koriya | 11 | Northampton | 46.56 |
| 5 | 5 | Grace Balneaves | 11 | Northampton | 50.91 |
| 6 | 6 | Ana Cucoranu | 11 | Corby | 52.40 |
| 7 | 7 | Ella Legg | 11 | Wellingboro | 53.29 |
| 8 | 8 | Annabelle Lucas | 11 | Northampton | 54.00 |