EVENT 101 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Violet RHODES | 12 | Team Luton | |
| 2 | 4 | Carolina PRUSAK | 12 | Team Luton | |
| 3 | 6 | Amelia WESTON | 12 | Flitwick | |
| 4 | 8 | Olivia PIASKOWSKA | 12 | Dunstable | |
| 5 | 7 | Tilly WATTS | 11 | Flitwick | |
| 6 | 5 | Tali FROOME | 14 | Harpenden | |
| 7 | 3 | Thea SLATER | 13 | Team Luton | |
| 8 | 1 | Ruth BISCOE | 11 | Team Luton | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Elsie COLE | 11 | Epping For't | 7:15.00 |
| 2 | 12 | Maisie HOWELL | 11 | Bo Southend | 6:51.03 |
| 3 | 14 | Fia BURR | 14 | Biggleswade | 6:30.13 |
| 4 | 16 | Zara BELNIKOFF | 13 | Epping For't | 6:21.38 |
| 5 | 15 | Morrigan COOPER | 12 | Bo Southend | 6:27.20 |
| 6 | 13 | Sarah APOSTOL | 11 | Epping For't | 6:50.39 |
| 7 | 11 | Amelie MURRAY | 11 | Epping For't | 7:04.98 |
| 8 | 9 | Olivia DE SOUSA REIS | 10 | Epping For't | 7:30.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Anna INGRAM | 14 | Ealing | 6:00.57 |
| 2 | 20 | Amy EDWARDS | 14 | Boldmere | 5:55.14 |
| 3 | 22 | Isobel MCKAY | 13 | Epping For't | 5:48.15 |
| 4 | 24 | Florence WHITTAKER | 14 | Biggleswade | 5:36.95 |
| 5 | 23 | Eliza JENNINGS | 13 | Biggleswade | 5:37.80 |
| 6 | 21 | Eliza SWANEPOEL | 17 | Epping For't | 5:53.59 |
| 7 | 19 | Elizabeth GORE | 13 | Epping For't | 5:57.07 |
| 8 | 17 | Freya BOOR | 14 | Biggleswade | 6:15.04 |