EVENT 604 Female 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Jessica Parry | 17 | Long Eaton | 10:13.16 |
| 2 | 4 | Ava Sinclair | 15 | Corby | 10:10.15 |
| 3 | 6 | Roisin Power | 14 | DerbyPhoenix | 10:07.94 |
| 4 | 8 | Vida Coulson | 12 | Northampton | 10:06.40 |
| 5 | 7 | Abigail Tomlinson | 12 | Corby | 10:07.28 |
| 6 | 5 | Eva Gallagher | 16 | Corby | 10:08.92 |
| 7 | 3 | Darcie Willis | 18 | Eckington | 10:12.09 |
| 8 | 1 | Mia Lever | 13 | Worksop | 10:14.08 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Ava Steans | 15 | Co Leicester | 10:06.14 |
| 2 | 12 | Isobelle Rafferty | 14 | Bassetlaw SS | 10:02.77 |
| 3 | 14 | Isobel Rush | 14 | Chesterfield | 10:02.00 |
| 4 | 16 | Iona Watson | 16 | Bassetlaw SS | 10:00.25 |
| 5 | 15 | Libby Rose | 16 | Radford | 10:01.53 |
| 6 | 13 | Paige Bagshaw | 14 | Nova Cent'n | 10:02.20 |
| 7 | 11 | Amy Palmer | 14 | Co Lincoln P | 10:05.44 |
| 8 | 9 | Tate Fox | 14 | Bassetlaw SS | 10:06.17 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Chloe Morley | 13 | Co Leicester | 9:53.98 |
| 2 | 20 | Nicola Michalska | 14 | Co Leicester | 9:51.48 |
| 3 | 22 | Molly Bradley | 14 | Nova Cent'n | 9:49.60 |
| 4 | 24 | Ayla Konuralp | 15 | Repton | 9:46.94 |
| 5 | 23 | Matilda Hase | 18 | Long Eaton | 9:49.37 |
| 6 | 21 | Maisie Matthews | 14 | Louth | 9:50.21 |
| 7 | 19 | Lucy Willatts | 14 | Grantham | 9:53.60 |
| 8 | 17 | Neya Vernon | 13 | Co Leicester | 9:57.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Daisy Tatlow-Turner | 15 | Chesterfield | 9:42.40 |
| 2 | 28 | Matilda McGrath | 18 | Derby Excel | 9:40.33 |
| 3 | 30 | Phoebe Benyon | 15 | Nova Cent'n | 9:38.11 |
| 4 | 32 | Sophie Lane | 13 | Co Leicester | 9:35.69 |
| 5 | 31 | Maddie Walden | 15 | Northampton | 9:37.80 |
| 6 | 29 | Summer Chirita | 13 | Repton | 9:38.38 |
| 7 | 27 | Evie Lilley | 16 | Lincoln Vulc | 9:41.34 |
| 8 | 25 | Emily Talkes | 13 | Lincoln Vulc | 9:44.74 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Phillippa Cutmore | 13 | Corby | 9:29.80 |
| 2 | 36 | Francesca Hallam-Stott | 18 | Nova Cent'n | 9:24.40 |
| 3 | 38 | Jessica Lines | 16 | Co Leicester | 9:17.39 |
| 4 | 40 | Emily Louise Riach | 23 | Nova Cent'n | 9:13.93 |
| 5 | 39 | Jennifer Walker | 17 | Bassetlaw SS | 9:14.54 |
| 6 | 37 | Sasha Dzus | 15 | Nova Cent'n | 9:18.30 |
| 7 | 35 | Grace Grindrod | 17 | Northampton | 9:25.52 |
| 8 | 33 | Amy Walker | 16 | Worksop | 9:34.91 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Phebe Adams | 16 | Northampton | 9:05.50 |
| 2 | 44 | Sana Le Falher | 18 | Repton | 9:00.25 |
| 3 | 46 | Alyssa Lo | 17 | Co Leicester | 8:55.68 |
| 4 | 48 | Jessica Smelt | 18 | Lboro Uni | 8:50.61 |
| 5 | 47 | Clara Ginnis | 18 | Repton | 8:55.53 |
| 6 | 45 | Francesca Harrison | 16 | Co Leicester | 8:59.60 |
| 7 | 43 | Frouke Ludwig | 17 | Lboro Uni | 9:04.20 |
| 8 | 41 | Holly Gent | 14 | Co Leicester | 9:09.80 |