EVENT 301 Girls 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Charlotte GILL | 15 | Grantham | |
| 3 | 2 | Sascha NEL | 13 | Grantham | |
| 4 | 3 | Eden DYSON | 12 | Grantham | |
| 5 | 4 | Juliette KING | 11 | Grantham | |
| 6 | 5 | Elisabeth KINNEAR | 13 | Grantham | 7:49.50 |
| 7 | 6 | Poppy HATHWAY | 12 | Grantham | 7:37.44 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Annie WEBSTER | 11 | Grantham | 7:35.27 |
| 2 | 8 | Isobel ALLSOP | 13 | Grantham | 6:51.82 |
| 3 | 9 | Isla GRAY | 13 | Grantham | 6:49.41 |
| 4 | 10 | Amy TAYLOR | 12 | Grantham | 6:30.16 |
| 5 | 11 | Ellena HOWITT | 12 | Grantham | 6:17.93 |
| 6 | 12 | Annabelle JAY | 12 | Grantham | 5:58.50 |
| 7 | 13 | Lucy WILLATTS | 12 | Grantham | 5:52.70 |
| 8 | 14 | Marcelina DEBICKA | 15 | Grantham | 5:52.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Grace HOWITT | 14 | Grantham | 5:45.94 |
| 2 | 18 | Harriet MCCORMACK | 14 | Grantham | 5:30.02 |
| 3 | 23 | Elena ALDENHOFF-KELLY | 15 | Grantham | 4:45.70 |
| 4 | 25 | Grace TURNER | 16 | Grantham | 4:39.66 |
| 5 | 24 | Grace MACDONALD | 14 | Grantham | 4:41.68 |
| 6 | 19 | Sophie WARD | 14 | Grantham | 5:29.96 |
| 7 | 17 | Amelia HATHWAY | 14 | Grantham | 5:36.33 |
| 8 | 15 | Lexie SHEWAN | 13 | Grantham | 5:50.75 |