| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Olivia FLETCHER | 16 | Worcester | : . |
| 1 | 2 | Emily NORRIS | 18 | Bromley | : . |
| 2 | 3 | Ally LARSON | 18 | Camden Swiss | : . |
| 3 | 4 | Amy FARTHING | 20 | Sevenoaks | : . |
| 4 | 5 | Rebecca SUTTON | 17 | Co Cardiff | : . |
| 5 | 6 | Maisie MACARTNEY | 17 | Thanet Swim | : . |
| 6 | 7 | Ekaterina AVRAMOVA | 27 | Ealing | : . |
| 7 | 8 | Olivia TATTON | 18 | Northampton | : . |
| 8 | 9 | Abigail BURR | 20 | Swansea Aq | : . |
| 9 | 10 | Mattea jay OLIVER | 18 | Co Liverpool | : . |