| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Jessica Morgan | 16 | Southport | : . |
| 1 | 2 | Ally Larson | 19 | Camden Swiss | : . |
| 2 | 3 | Amy Farthing | 21 | Sevenoaks | : . |
| 3 | 4 | Imogen Meers | 17 | Bromley | : . |
| 4 | 5 | Niamh Robinson | 20 | Mt Kelly | : . |
| 5 | 6 | Grace King | 16 | teamipswich | : . |
| 6 | 7 | Kaelah Lawson | 17 | Co Milton K | : . |
| 7 | 8 | Daisy Anderson | 18 | Thanet Swim | : . |
| 8 | 9 | Zara Keegan | 17 | Co Cambridge | : . |
| 9 | 10 | Olivia Fletcher | 17 | Worcester | : . |