| Final | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Abbie Hackworth | 12 | Hatfield | 43.54 |
| 2 | 2 | Leila Odaro-Burnett | 12 | Hatfield | 42.48 |
| 3 | 3 | S Harrison-Mirauer | 12 | Co St Albans | 41.58 |
| 4 | 4 | Megan Gray | 12 | Hatfield | 40.62 |
| 5 | 5 | Alice Longman | 12 | Bishop Stort | 41.28 |
| 6 | 6 | Kirsty Neill | 12 | Bishop Stort | 42.10 |
| 7 | 7 | Laura Malagoli | 12 | Hertford | 42.55 |
| 8 | 8 | Rachael Carpenter | 12 | Hoddesdon | 43.72 |