EVENT 401 Female 10 Yrs/Over 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Daria Bielawski | 11 | Northampton | 6:43.40 |
| 3 | 4 | Isla Adams | 12 | Northampton | 6:33.40 |
| 4 | 6 | Olivia Fern | 11 | Northampton | 6:16.66 |
| 5 | 5 | Mollie Smart | 11 | Co Leicester | 6:31.68 |
| 6 | 3 | Lola Nevzat | 12 | Flitwick | 6:36.14 |
| 7 | 1 | Evie Davies | 12 | Deepings | 6:51.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Sophie Andrews | 11 | Flitwick | 6:16.41 |
| 2 | 10 | Violet Moran | 12 | Radford | 6:15.71 |
| 3 | 12 | Milly Webb | 11 | Northampton | 6:02.50 |
| 4 | 14 | Ellie Poulton-Burbank | 14 | Co Leicester | 5:56.70 |
| 5 | 13 | Harriet Jennings | 12 | Co Leicester | 5:58.67 |
| 6 | 11 | Isla-Rose Wildish | 11 | Bassetlaw SS | 6:12.43 |
| 7 | 9 | Emmie-Rose Power | 12 | Co Leicester | 6:16.32 |
| 8 | 7 | Daisy-Grace Wildish | 10 | Bassetlaw SS | 6:16.58 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Vida Coulson | 12 | Northampton | 5:43.40 |
| 2 | 18 | Neya Vernon | 13 | Co Leicester | 5:36.70 |
| 3 | 20 | Charlotte Lucas | 12 | Co Leicester | 5:35.00 |
| 4 | 22 | Chloe Morley | 13 | Co Leicester | 5:27.60 |
| 5 | 21 | Ava Steans | 15 | Co Leicester | 5:28.24 |
| 6 | 19 | Laura Graham-Brown | 14 | Co Leicester | 5:36.69 |
| 7 | 17 | Maddie Walden | 15 | Northampton | 5:39.90 |
| 8 | 15 | Tate Fox | 14 | Bassetlaw SS | 5:51.67 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Maisie Matthews | 14 | Louth | 5:19.60 |
| 2 | 26 | Sophie Lane | 13 | Co Leicester | 5:17.69 |
| 3 | 28 | Manon Lythgoe | 16 | Swansea Aq | 5:14.05 |
| 4 | 30 | Elkie Foster | 14 | Co Leeds | 5:11.10 |
| 5 | 29 | Chloe Gent | 15 | Co Leicester | 5:11.54 |
| 6 | 27 | Phebe Adams | 16 | Northampton | 5:16.00 |
| 7 | 25 | Willow Wright | 12 | Co Leeds | 5:19.50 |
| 8 | 23 | Holly Hayle | 16 | Northampton | 5:26.10 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Ella Bissicks | 18 | Swansea Uni | 5:05.29 |
| 2 | 34 | Francesca Harrison | 16 | Co Leicester | 4:57.52 |
| 3 | 36 | Emily England-Hall | 13 | Co Leeds | 4:55.60 |
| 4 | 38 | Darcie Platts | 17 | Co Leicester | 4:50.74 |
| 5 | 37 | Frouke Ludwig | 17 | Lboro Uni | 4:51.86 |
| 6 | 35 | Isabelle Hall | 14 | Co Leeds | 4:55.70 |
| 7 | 33 | Holly Gent | 14 | Co Leicester | 5:04.20 |
| 8 | 31 | Addison Cropper | 12 | Co Leeds | 5:06.20 |