| Fastest Heat - 4 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 29 | Mollie Wright | 19 | Nova Cent'n | : . |
| 1 | 31 | Phoebe Griffiths | 17 | Ellesmere Co | : . |
| 2 | 33 | Maisie Macartney | 16 | Thanet Swim | : . |
| 3 | 35 | Alice Dearing | 20 | Loughboro Un | : . |
| 4 | 37 | Holly Hibbott | 18 | Stockport Mo | : . |
| 5 | 36 | Danielle Huskisson | 24 | UniOfStirl | : . |
| 6 | 34 | Leah Crisp | 16 | Co Leeds | : . |
| 7 | 32 | Hannah Miley | 28 | Aberdeen Per | : . |
| 8 | 28 | Emily Clarke | 20 | Loughboro Un | : . |
| 9 | 30 | Abbie Houston | 22 | Co Sheffield | : . |