EVENT 604 Female 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Roisin Power | 13 | DerbyPhoenix | 10:19.20 |
| 2 | 4 | Jessica Herriott | 16 | South Lincs | 10:18.49 |
| 3 | 6 | Gracie-May Cole | 16 | Lincoln Vulc | 10:18.36 |
| 4 | 8 | Iona Watson | 15 | Bassetlaw SS | 10:14.87 |
| 5 | 7 | Nicola Michalska | 13 | Co Leicester | 10:15.34 |
| 6 | 5 | Jessica Parry | 16 | Long Eaton | 10:18.38 |
| 7 | 3 | Florence Senior | 14 | Co Leicester | 10:18.78 |
| 8 | 1 | Isobelle Rafferty | 13 | Bassetlaw SS | 10:20.23 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Ava Steans | 14 | Co Leicester | 10:12.66 |
| 2 | 12 | Sasha Dzus | 14 | Nova Cent'n | 10:05.30 |
| 3 | 14 | Daisy Tatlow-Turner | 14 | Chesterfield | 10:03.50 |
| 4 | 16 | Neya Vernon | 12 | Lincoln Vulc | 10:00.60 |
| 5 | 15 | Libby Cooper | 15 | Nova Cent'n | 10:02.50 |
| 6 | 13 | Philippa Bodey | 13 | Co Leicester | 10:03.54 |
| 7 | 11 | Lauren Morley | 15 | Kettering | 10:08.80 |
| 8 | 9 | Eva Gallagher | 15 | Corby | 10:13.30 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Phillippa Cutmore | 12 | Corby | 9:56.10 |
| 2 | 20 | Amelia Roberts | 16 | Sutton | 9:54.72 |
| 3 | 22 | Sarah Dew | 17 | Leic Sharks | 9:50.16 |
| 4 | 24 | Olivia Male | 13 | Derby Excel | 9:46.80 |
| 5 | 23 | Lana Webb | 15 | Northampton | 9:49.27 |
| 6 | 21 | Emily Talkes | 12 | Lincoln Vulc | 9:51.61 |
| 7 | 19 | Ayla Konuralp | 14 | Repton | 9:55.00 |
| 8 | 17 | Caitlin Leach | 16 | Radford | 9:59.94 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Amy Walker | 15 | Worksop | 9:40.80 |
| 2 | 28 | Matilda McGrath | 17 | Braunstone | 9:36.38 |
| 3 | 30 | Lillie Hamilton | 16 | Louth | 9:34.29 |
| 4 | 32 | Francesca Hallam-Stott | 17 | Grantham | 9:30.25 |
| 5 | 31 | Grace Grindrod | 16 | Northampton | 9:32.20 |
| 6 | 29 | Maddie Walden | 14 | Northampton | 9:35.60 |
| 7 | 27 | Orna Lett | 14 | Northampton | 9:39.40 |
| 8 | 25 | Evie Lilley | 15 | Bassetlaw SS | 9:46.20 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Grace Turner | 17 | Grantham | 9:24.40 |
| 2 | 36 | Holly Gent | 13 | Co Leicester | 9:23.40 |
| 3 | 38 | Beau Cunningham | 15 | Corby | 9:21.50 |
| 4 | 40 | Lily Freeman | 17 | Northampton | 9:19.60 |
| 5 | 39 | Francesca Harrison | 15 | Co Leicester | 9:19.70 |
| 6 | 37 | Jessica Lines | 15 | Co Leicester | 9:23.20 |
| 7 | 35 | Janie Finch | 14 | Co Leicester | 9:23.68 |
| 8 | 33 | Jasmine Vaartjes | 15 | Repton | 9:26.20 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Phebe Adams | 15 | Northampton | 9:15.80 |
| 2 | 44 | Clara Ginnis | 17 | Repton | 9:07.64 |
| 3 | 49 | Phoebe Benyon | 14 | Nova Cent'n | 10:.2.1. |
| 4 | 48 | Lucy Fox | 18 | Lboro Uni | 8:34.52 |
| 5 | 47 | Jessica Smelt | 17 | Repton | 8:54.20 |
| 6 | 45 | Alyssa Lo | 16 | Co Leicester | 9:04.01 |
| 7 | 43 | Freya Jones | 16 | Nova Cent'n | 9:15.41 |
| 8 | 41 | Sana Le Falher | 17 | Repton | 9:17.80 |