EVENT 406 Girl Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Isla RICHARDS | 10 | Bassetlaw SS | 8:14.11 |
| 2 | 3 | Mia WALLACE | 10 | Eckington | 7:00.00 |
| 3 | 5 | Chloe DINMORE | 12 | Gainsborough | 6:42.38 |
| 4 | 4 | Emma AFFLECK | 11 | Deepings | 6:48.64 |
| 5 | 2 | Charlotte DENON | 12 | Eckington | 7:04.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Charlotte JENKINSON | 12 | Deepings | 6:36.56 |
| 2 | 9 | Elspeth DUMPHY-WRAITH | 11 | Matlock | 6:10.34 |
| 3 | 11 | Stansie CROWE | 11 | Bassetlaw SS | 5:55.38 |
| 4 | 10 | Hannah CROKER | 15 | Bircotes SC | 6:00.00 |
| 5 | 8 | Georgia TAYLOR | 15 | Eckington | 6:14.87 |
| 6 | 6 | Mia RICHARDS | 13 | Bassetlaw SS | 6:37.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Scarlett SAMPSON | 13 | Eckington | 5:51.26 |
| 2 | 15 | Alisha CAMERON | 13 | Sheffield C | 5:43.18 |
| 3 | 17 | Isla JOHNSON | 11 | Derventio | 5:30.79 |
| 4 | 16 | Iona WATSON | 13 | Bassetlaw SS | 5:40.44 |
| 5 | 14 | Isobelle RAFFERTY | 11 | Bassetlaw SS | 5:49.52 |
| 6 | 12 | Isla STOCKLEY | 10 | Bassetlaw SS | 5:55.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Sophie MARSHALL | 17 | Co Lincoln P | 5:25.90 |
| 2 | 21 | Abigail BETTS | 12 | Bassetlaw SS | 5:24.27 |
| 3 | 23 | Molly HAMBLEN | 13 | Derventio | 5:14.48 |
| 4 | 22 | Emmy STINTON | 12 | Co Lincoln P | 5:20.00 |
| 5 | 20 | Abigail ROWLAND | 14 | Bassetlaw SS | 5:25.76 |
| 6 | 18 | Tate FOX | 11 | Bassetlaw SS | 5:27.41 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Stephanie RADATZ | 16 | Sheffield C | 5:09.77 |
| 2 | 27 | Olivia MARSHALL | 14 | Derventio | 5:08.34 |
| 3 | 29 | Emma Jane RANTZEN | 12 | Derventio | 5:05.83 |
| 4 | 28 | Penelope BAXTER | 16 | Deepings | 5:05.90 |
| 5 | 26 | Isla O'CONNOR | 12 | Bassetlaw SS | 5:09.58 |
| 6 | 24 | Freya LESTER | 15 | Matlock | 5:10.14 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Margaret WELSH | 14 | Derventio | 5:03.13 |
| 2 | 33 | Kessie WEBSTER | 12 | Derventio | 5:02.63 |
| 3 | 35 | Matilda HASE | 15 | Derventio | 4:53.79 |
| 4 | 34 | Abbie TUNNICLIFFE | 14 | Derventio | 4:54.12 |
| 5 | 32 | Isabelle BRAILSFORD | 15 | Derventio | 5:03.13 |
| 6 | 30 | Elodie HERON | 13 | Derventio | 5:03.21 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 37 | Neve PING | 13 | Bassetlaw SS | 4:50.50 |
| 2 | 39 | Jennifer WALKER | 14 | Bassetlaw SS | 4:38.04 |
| 3 | 41 | Amelia STEVENSON | 17 | Bassetlaw SS | 4:29.89 |
| 4 | 40 | Lucy CADDEN | 18 | Derventio | 4:33.87 |
| 5 | 38 | Ruby CREDLAND | 15 | Bassetlaw SS | 4:45.70 |
| 6 | 36 | Abigail ARMSTRONG | 15 | Sheffield C | 4:52.35 |