| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Maisie LYONS | 12 | Worcester | : . |
| 1 | 2 | Emily GUNN | 12 | Bromley | : . |
| 2 | 3 | Madeleine LIDDELL | 12 | Camden Swiss | : . |
| 3 | 4 | Emily BROWN | 12 | Sevenoaks | : . |
| 4 | 5 | Pheobe WILLIAMS-JONES | 12 | Co Cardiff | : . |
| 5 | 6 | Amber PIPER | 12 | Thanet Swim | : . |
| 6 | 7 | Emily LEONARD | 12 | Ealing | : . |
| 7 | 8 | Pia SUMMERS-NEWTON | 12 | Northampton | : . |
| 8 | 9 | Seren THOMAS | 12 | Swansea Aq | : . |
| 9 | 10 | Ashlyn WARNOCK | 12 | Co Liverpool | : . |