| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Isobel FOSTER | 12 | Worcester | : . |
| 1 | 2 | Beatrice PICKERING | 11 | Bromley | : . |
| 2 | 3 | Ava LAMBROPOULOS | 11 | Camden Swiss | : . |
| 3 | 4 | Eva OKARO | 12 | Sevenoaks | : . |
| 4 | 5 | Ruby STEVENS | 12 | Co Cardiff | : . |
| 5 | 6 | Saskia MYBURGH | 11 | Thanet Swim | : . |
| 6 | 7 | Roxanne LAWSON | 12 | Ealing | : . |
| 7 | 8 | Evie WOOLLEY | 12 | Northampton | : . |
| 8 | 9 | Charlotte SMART | 11 | Swansea Aq | : . |
| 9 | 10 | Elise BRUNS | 12 | Co Liverpool | : . |