EVENT 404 Female 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Millie HAGLAND | 11 | Biggleswade | |
| 3 | 4 | Carolina PRUSAK | 12 | Team Luton | |
| 4 | 6 | Jessica DAWES | 10 | Flitwick | 2:01.40 |
| 5 | 5 | Keira Rose BOUQUET | 11 | Ealing | |
| 6 | 3 | Victoria BANDURAC | 10 | Linslade | |
| 7 | 1 | Emily EMMS | 11 | Biggleswade | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Hannah LAM | 10 | Epping For't | 2:00.00 |
| 2 | 10 | Carla GARCIA-RONCERO | 10 | Ealing | 1:51.43 |
| 3 | 12 | Charlotte COX | 16 | Linslade | 1:48.98 |
| 4 | 14 | Bella STOREY | 10 | Flitwick | 1:47.40 |
| 5 | 13 | Charley COOK | 12 | Flitwick | 1:47.97 |
| 6 | 11 | Tilly WATTS | 11 | Flitwick | 1:50.80 |
| 7 | 9 | Amelie TITOT | 12 | Epping For't | 2:00.00 |
| 8 | 7 | Jiali JIAO | 9 | Epping For't | 2:00.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Tia ELSEY | 11 | Linslade | 1:42.90 |
| 2 | 18 | Zoe Arianna NYKER | 11 | Ealing | 1:42.24 |
| 3 | 20 | Ida CORCORAN | 15 | Flitwick | 1:40.30 |
| 4 | 22 | Phoebe DOUGLAS | 12 | Bo Southend | 1:37.80 |
| 5 | 21 | Amelie MURRAY | 11 | Epping For't | 1:38.19 |
| 6 | 19 | Inaaya SAMPONG | 12 | Team Luton | 1:40.51 |
| 7 | 17 | Olivia GOTHARD | 13 | Linslade | 1:42.83 |
| 8 | 15 | Edith ELLISON | 11 | Epping For't | 1:44.45 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Taitiana MBILI | 14 | Bo Southend | 1:35.92 |
| 2 | 26 | Sophia LABRANDE | 12 | Willesden | 1:31.67 |
| 3 | 28 | Aimee HILL | 13 | Linslade | 1:31.10 |
| 4 | 30 | Cora PAYNE | 10 | Bletchley | 1:27.48 |
| 5 | 29 | Kaylyn SAMPONG | 14 | Team Luton | 1:28.39 |
| 6 | 27 | Sarah APOSTOL | 11 | Epping For't | 1:31.50 |
| 7 | 25 | Saxon SWANN | 13 | Corby | 1:34.27 |
| 8 | 23 | Nicole CALIN | 11 | Ealing | 1:36.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Macey TOWNS | 13 | Bo Southend | 1:26.60 |
| 2 | 35 | Rowena BARNARD | 15 | Epping For't | 1:21.54 |
| 3 | 37 | Eliza JENNINGS | 13 | Biggleswade | 1:17.14 |
| 4 | 39 | Anna REGAN | 13 | Bo Southend | 1:15.67 |
| 5 | 38 | Charlotte STOCKS | 12 | Linslade | 1:16.80 |
| 6 | 36 | Arabella BEEVERS | 13 | Bo Southend | 1:20.83 |
| 7 | 34 | Chloe MATTHEWS | 13 | Linslade | 1:24.70 |
| 8 | 31 | Ruth BISCOE | 11 | Team Luton | 1:27.00 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 41 | Amy EDWARDS | 14 | Boldmere | 1:14.31 |
| 2 | 43 | Amber TIGHT | 14 | Flitwick | 1:12.80 |
| 3 | 45 | Florence WHITTAKER | 14 | Biggleswade | 1:11.07 |
| 4 | 47 | Jessica MEDLICOTT | 18 | Dunstable | 1:05.31 |
| 5 | 46 | Niamh BUNKER | 15 | Flitwick | 1:10.77 |
| 6 | 44 | Amy HARRIS | 14 | Broomfield | 1:11.37 |
| 7 | 42 | Eva JACKSON | 13 | Flitwick | 1:13.50 |
| 8 | 40 | Emily JOYCE | 12 | Biggleswade | 1:14.47 |