| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Esmie Haines | 10 | Northampton | 45.17 |
| 2 | 2 | Cadence Flynn | 11 | Northampton | 44.57 |
| 3 | 3 | Phillippa Cutmore | 11 | Corby | 42.96 |
| 4 | 4 | Martha Booker | 11 | Wellingboro | 40.47 |
| 5 | 5 | Carys Thomas | 11 | Nene Valley | 41.57 |
| 6 | 6 | Elisa Giraud | 11 | Kettering | 44.10 |
| 7 | 7 | Mea Moore | 10 | Corby | 44.67 |
| 8 | 8 | Jasmin Dodds | 11 | Wellingboro | 45.30 |