| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Heather Sayers | 11 | Weymouth | 50.72 |
| 2 | 2 | Mia Palmer | 11 | Poole | 48.83 |
| 3 | 3 | Daisy Kirkpatrick | 11 | Wareham | 47.30 |
| 4 | 4 | Daria Korotkova | 11 | Poole | 43.42 |
| 5 | 5 | Tabitha Buchan-Moore | 11 | West Dorset | 44.74 |
| 6 | 6 | Amelia Newsum | 11 | S Bournem'th | 47.88 |
| 7 | 7 | Isabelle Macrae | 11 | S Bournem'th | 50.27 |
| 8 | 8 | Theia Bull | 11 | Poole | 51.34 |