EVENT 101 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Alice Knott | 12 | Northampton | 6:45.00 |
| 4 | 4 | Isabella Knight | 14 | Northampton | 6:30.00 |
| 5 | 3 | Beatrice Britton | 12 | Braunstone | 6:36.10 |
| 6 | 1 | Morgan Sawyer | 10 | Coalville | 7:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Hollie Willars | 11 | Braunstone | 6:15.76 |
| 2 | 8 | Emmie-Rose Power | 11 | Co Leicester | 6:10.18 |
| 3 | 10 | Ava Mitchell | 12 | Northampton | 6:08.39 |
| 4 | 12 | Vida Coulson | 11 | Northampton | 6:04.71 |
| 5 | 11 | Isabella Derbyshire | 11 | Co Leicester | 6:07.66 |
| 6 | 9 | Ruby Richardson | 12 | Co Leicester | 6:09.66 |
| 7 | 7 | Eve Taylor | 15 | Northampton | 6:15.00 |
| 8 | 5 | Aimee Walczak | 13 | Leic Peng | 6:17.81 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Heather Wylie | 12 | Wrekin SC | 5:57.37 |
| 2 | 16 | Eliza Cresswell | 13 | Royal Wolv | 5:35.79 |
| 3 | 18 | India Sawyer | 12 | Coalville | 5:26.88 |
| 4 | 20 | Lois Buxton | 15 | Loughborough | 5:19.07 |
| 5 | 19 | Hollie Cowles | 13 | Braunstone | 5:22.06 |
| 6 | 17 | Laura Graham-Brown | 13 | Co Leicester | 5:29.16 |
| 7 | 15 | Elisa Giraud | 12 | Northampton | 5:39.16 |
| 8 | 13 | Shivani Sharma | 11 | Braunstone | 5:58.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Emilia Durrington | 14 | Co Leicester | 5:17.79 |
| 2 | 24 | Jessica Greenhalgh | 13 | Co Leicester | 5:17.08 |
| 3 | 26 | Isabelle Walczak | 16 | Leic Peng | 5:14.09 |
| 4 | 28 | Emily Denton | 15 | Northampton | 5:11.83 |
| 5 | 27 | Chloe Gent | 14 | Co Leicester | 5:12.19 |
| 6 | 25 | Maisie Whitehead | 13 | Worksop | 5:16.34 |
| 7 | 23 | Marta Uciecha | 14 | Co Leicester | 5:17.70 |
| 8 | 21 | A Thorpe-Williams | 12 | Northampton | 5:18.30 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 30 | Paige Bagshaw | 13 | Arnold | 5:10.13 |
| 2 | 32 | Nicola Michalska | 13 | Co Leicester | 5:09.12 |
| 3 | 34 | Erika Clarke | 13 | Co Leicester | 5:06.70 |
| 4 | 36 | Millie Cadden | 17 | Long Eaton | 5:04.98 |
| 5 | 35 | Florence Senior | 14 | Co Leicester | 5:05.93 |
| 6 | 33 | Luan Power | 15 | Hinckley | 5:07.99 |
| 7 | 31 | Abigail Golynker | 14 | Co Leicester | 5:09.61 |
| 8 | 29 | Ava Steans | 14 | Co Leicester | 5:11.08 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 38 | Jessica Parry | 16 | Long Eaton | 5:01.43 |
| 2 | 40 | Maddie Wilson | 14 | Long Eaton | 5:00.70 |
| 3 | 42 | Jessica Oxley | 15 | Co Leicester | 4:50.00 |
| 4 | 44 | Anna Clarke | 15 | Co Leicester | 4:47.20 |
| 5 | 43 | Dorothy Plumpton | 15 | Co Leicester | 4:48.29 |
| 6 | 41 | Philippa Bodey | 13 | Co Leicester | 4:58.53 |
| 7 | 39 | Emma Graham-Brown | 15 | Co Leicester | 5:01.20 |
| 8 | 37 | Mia Wilson | 16 | Long Eaton | 5:03.00 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 46 | Holly Gent | 13 | Co Leicester | 4:46.47 |
| 2 | 48 | Annabel Russell | 18 | Co Leicester | 4:42.10 |
| 3 | 50 | Jessica Lines | 15 | Co Leicester | 4:37.30 |
| 4 | 52 | Francesca Harrison | 15 | Co Leicester | 4:32.90 |
| 5 | 51 | Janie Finch | 14 | Co Leicester | 4:35.97 |
| 6 | 49 | Sophie Statham-Gill | 15 | Co Leicester | 4:37.43 |
| 7 | 47 | Matilda McGrath | 17 | Braunstone | 4:45.64 |
| 8 | 45 | Kate Andrews | 16 | Co Leicester | 4:46.71 |