EVENT 303 Female 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Sofia Puscasu | 14 | Northampton | 2:00.00 |
| 4 | 4 | Vida Coulson | 11 | Northampton | 1:53.19 |
| 5 | 3 | Ava Mitchell | 12 | Northampton | 1:55.00 |
| 6 | 1 | Isabella Knight | 14 | Northampton | 2:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Emmie-Rose Power | 11 | Co Leicester | 1:40.10 |
| 2 | 8 | Maya Glassford | 14 | Melton M'bry | 1:31.55 |
| 3 | 10 | Violet Warwick | 13 | Long Eaton | 1:27.47 |
| 4 | 12 | Erika Clarke | 13 | Co Leicester | 1:25.90 |
| 5 | 11 | Connie Kyle | 12 | Co Leicester | 1:26.91 |
| 6 | 9 | Evie Littlefield | 12 | Shrewsbury | 1:28.62 |
| 7 | 7 | Katherine Fletcher | 11 | Co Leicester | 1:35.84 |
| 8 | 5 | Emma Ruiz Salfity | 12 | Loughborough | 1:46.33 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Amy Edwards | 13 | Boldmere | 1:24.45 |
| 2 | 16 | Maisie Whitehead | 13 | Worksop | 1:23.04 |
| 3 | 18 | Isobel Rush | 13 | Arnold | 1:19.91 |
| 4 | 20 | Megan Jackson-Oates | 14 | Arnold | 1:16.60 |
| 5 | 19 | Amy Walker | 15 | Worksop | 1:17.09 |
| 6 | 17 | Kirsten Ulph | 14 | Leicester Ne | 1:19.98 |
| 7 | 15 | Karolina Parkinson | 14 | Lincoln Vulc | 1:23.27 |
| 8 | 13 | Isabella Derbyshire | 11 | Co Leicester | 1:25.02 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Abigail Golynker | 14 | Co Leicester | 1:15.27 |
| 2 | 24 | Ella Bourne | 15 | Repton | 1:13.20 |
| 3 | 26 | Annabel Russell | 18 | Co Leicester | 1:11.19 |
| 4 | 28 | Francesca Harrison | 15 | Co Leicester | 1:05.80 |
| 5 | 27 | Evie Wood | 22 | Braunstone | 1:09.32 |
| 6 | 25 | Isabelle Rose | 15 | Co Leicester | 1:12.90 |
| 7 | 23 | Sophie Gibbs | 17 | Radford | 1:14.82 |
| 8 | 21 | Evie Solomons | 15 | Worksop | 1:16.00 |