EVENT 404 Female 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Rahil ABWOOLI | 10 | TigersJersey | |
| 4 | 3 | Tia ELSEY | 10 | Linslade | |
| 5 | 2 | Dorothea WARD | 11 | Bushey | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Lauren TOUGH | 13 | Team Luton | |
| 2 | 8 | Adel TONKO | 11 | TigersJersey | 1:44.30 |
| 3 | 10 | Chloe MATTHEWS | 12 | Linslade | 1:38.50 |
| 4 | 14 | ELLA MCLOUGHLIN | 13 | Broomfield | 1:27.80 |
| 5 | 13 | Emily JOYCE | 11 | Biggleswade | 1:28.50 |
| 6 | 9 | Inaaya SAMPONG | 11 | Team Luton | 1:41.30 |
| 7 | 7 | Lilly SMITH | 12 | Haringey | 1:45.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Elissa NEO | 11 | Linslade | 1:26.91 |
| 2 | 18 | Emilie HIGGS | 14 | Newport Pag | 1:26.80 |
| 3 | 20 | Lio BROWN | 17 | Newport Pag | 1:25.70 |
| 4 | 23 | Tara SHAH | 13 | Bushey | 1:22.20 |
| 5 | 22 | Alice WILSON | 13 | New Hall | 1:24.00 |
| 6 | 19 | Eliza JENNINGS | 12 | Biggleswade | 1:26.40 |
| 7 | 17 | Olivia PIASKOWSKA | 11 | Team Luton | 1:26.84 |
| 8 | 15 | Libby FLITTON | 11 | Dunstable | 1:26.96 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Julia STRZEZEK | 12 | TigersJersey | 1:19.38 |
| 2 | 28 | Amerie NJAWAYA | 13 | Team Luton | 1:17.30 |
| 3 | 30 | AMY HARRIS | 13 | Broomfield | 1:15.00 |
| 4 | 34 | Nell COSTER | 15 | Berkhamsted | 1:11.10 |
| 5 | 31 | Tsz Yin LEUNG | 14 | Newport Pag | 1:14.20 |
| 6 | 29 | Florence WHITTAKER | 13 | Biggleswade | 1:16.13 |
| 7 | 27 | Seanna KANDOLA | 14 | Bushey | 1:18.00 |
| 8 | 24 | Grace CRACKNELL | 14 | Watford SC | 1:20.00 |