EVENT 301 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 2 | Scarlett Humphrey | 19 | S11 | Northampton | 5:18.50 |
| 4 | 4 | Jessica Ball | 14 | | Mansfield | 4:56.44 |
| 5 | 3 | Ahalya Lettenberger | 23 | S7 | Lboro Uni | 5:12.40 |
| 6 | 1 | Eliza Humphrey | 19 | S11 | Northampton | 5:26.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 6 | Faye Eyton-Jones | 15 | | Corby | 4:56.21 |
| 2 | 8 | Neya Vernon | 12 | | Lincoln Vulc | 4:55.50 |
| 3 | 10 | Eva Gallagher | 15 | | Corby | 4:55.31 |
| 4 | 12 | Maddie Wilson | 14 | | Long Eaton | 4:53.77 |
| 5 | 11 | Isabelle Rose | 15 | | Co Leicester | 4:55.02 |
| 6 | 9 | Ava Steans | 14 | | Co Leicester | 4:55.34 |
| 7 | 7 | Chloe Morley | 12 | | Co Leicester | 4:56.09 |
| 8 | 5 | Tate Fox | 13 | | Bassetlaw SS | 4:56.25 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 14 | Florence Senior | 14 | | Co Leicester | 4:52.93 |
| 2 | 16 | Mia Wilson | 16 | | Long Eaton | 4:52.37 |
| 3 | 18 | Sian Hedley | 13 | | Nova Cent'n | 4:51.64 |
| 4 | 20 | Philippa Bodey | 13 | | Co Leicester | 4:50.19 |
| 5 | 19 | Caitlin Leach | 16 | | Radford | 4:51.51 |
| 6 | 17 | Lauren Morley | 15 | | Kettering | 4:52.30 |
| 7 | 15 | Nicola Michalska | 13 | | Co Leicester | 4:52.64 |
| 8 | 13 | Amelia Roberts | 16 | | Sutton | 4:53.02 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 22 | Amber Haycock | 17 | S10 | Northampton | 4:49.20 |
| 2 | 24 | Sasha Dzus | 14 | | Nova Cent'n | 4:48.20 |
| 3 | 26 | Sarah Dew | 17 | | Leic Sharks | 4:47.93 |
| 4 | 28 | Ayla Konuralp | 14 | | Repton | 4:47.80 |
| 5 | 27 | Elena Aldenhoff-Kelly | 16 | | Grantham | 4:47.83 |
| 6 | 25 | Phoebe Benyon | 14 | | Nova Cent'n | 4:48.09 |
| 7 | 23 | Erin Ingham | 16 | | Louth | 4:49.12 |
| 8 | 21 | Daisy Tatlow-Turner | 14 | | Chesterfield | 4:50.10 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 30 | Matilda Hase | 17 | | Long Eaton | 4:47.20 |
| 2 | 32 | Lily-Grace Belfield | 14 | | Chesterfield | 4:47.01 |
| 3 | 34 | C Callaghan-Wetton | 15 | | Nova Cent'n | 4:46.51 |
| 4 | 36 | Olivia Graham | 13 | | Repton | 4:46.05 |
| 5 | 35 | Emily Talkes | 12 | | Lincoln Vulc | 4:46.30 |
| 6 | 33 | Kyra Winter | 13 | | Chesterfield | 4:46.52 |
| 7 | 31 | Lana Webb | 15 | | Northampton | 4:47.18 |
| 8 | 29 | Sadie Llewellyn | 15 | | Repton | 4:47.49 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 38 | Evie Lilley | 15 | | Bassetlaw SS | 4:45.70 |
| 2 | 40 | Maisie Matthews | 13 | | Louth | 4:45.13 |
| 3 | 42 | Melande Badenhorst | 13 | | Corby | 4:43.57 |
| 4 | 44 | Lillie Hamilton | 16 | | Louth | 4:40.78 |
| 5 | 43 | Ella Mae Prior | 16 | | Corby | 4:40.99 |
| 6 | 41 | Olivia Male | 13 | | Derby Excel | 4:44.40 |
| 7 | 39 | Phillippa Cutmore | 12 | | Corby | 4:45.67 |
| 8 | 37 | Orna Lett | 14 | | Northampton | 4:45.95 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 46 | Yanet Fung | 16 | | Derby Excel | 4:39.80 |
| 2 | 48 | Amy Walker | 15 | | Worksop | 4:38.04 |
| 3 | 50 | Jessica Oxley | 15 | | Co Leicester | 4:36.40 |
| 4 | 52 | Grace Grindrod | 16 | | Northampton | 4:34.60 |
| 5 | 51 | Hannah Bruce | 15 | | South Lincs | 4:35.39 |
| 6 | 49 | Olivia Beard | 16 | | Nova Cent'n | 4:36.45 |
| 7 | 47 | Francesca Hallam-Stott | 17 | | Grantham | 4:38.67 |
| 8 | 45 | Matilda McGrath | 17 | | Braunstone | 4:39.96 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 54 | Jennifer Walker | 16 | | Bassetlaw SS | 4:33.59 |
| 2 | 56 | Jasmine Vaartjes | 15 | | Repton | 4:32.90 |
| 3 | 58 | Sana Le Falher | 17 | | Repton | 4:31.10 |
| 4 | 60 | Holly Gent | 13 | | Co Leicester | 4:29.91 |
| 5 | 59 | Phebe Adams | 15 | | Northampton | 4:31.00 |
| 6 | 57 | Jessica Lines | 15 | | Co Leicester | 4:31.56 |
| 7 | 55 | Beau Cunningham | 15 | | Corby | 4:33.10 |
| 8 | 53 | Chiara Reedha | 15 | | Co Leicester | 4:34.30 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 62 | Lilli-Rose Carr | 15 | | Nova Cent'n | 4:29.24 |
| 2 | 64 | Janie Finch | 14 | | Co Leicester | 4:28.41 |
| 3 | 66 | Grace Turner | 17 | | Grantham | 4:27.50 |
| 4 | 68 | Francesca Harrison | 15 | | Co Leicester | 4:25.62 |
| 5 | 67 | Sophie Martin | 17 | | Chesterfield | 4:26.10 |
| 6 | 65 | Clara Ginnis | 17 | | Repton | 4:28.03 |
| 7 | 63 | Jessica Cater | 17 | | Bramcote | 4:28.90 |
| 8 | 61 | Emilia Cieszczyk | 17 | | Northampton | 4:29.54 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 70 | Lydia Cordle | 14 | | Repton | 4:24.40 |
| 2 | 72 | Alexandra Bulat | 18 | | Co Lincoln P | 4:22.50 |
| 3 | 74 | Hannah Hodgkiss | 18 | | Repton | 4:20.90 |
| 4 | 76 | Alyssa Lo | 16 | | Co Leicester | 4:20.00 |
| 5 | 75 | Madison Emment | 17 | | Repton | 4:20.00 |
| 6 | 73 | Holly Marshall | 18 | | Lincoln Vulc | 4:21.60 |
| 7 | 71 | Kasia Titterton | 18 | | Uni of Nott | 4:23.22 |
| 8 | 69 | Lily Freeman | 17 | | Northampton | 4:24.40 |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 78 | Honey Osrin | 21 | | Lboro Uni | 4:12.00 |
| 2 | 80 | Medi Harris | 22 | | Lboro Uni | 4:12.00 |
| 3 | 82 | Lucy Fox | 18 | | Lboro Uni | 4:07.70 |
| 4 | 84 | Freya Colbert | 20 | | Lboro Uni | 4:02.38 |
| 5 | 83 | Fleur Lewis | 21 | | Lboro Uni | 4:07.60 |
| 6 | 81 | Mia Slevin | 21 | | Lboro Uni | 4:08.46 |
| 7 | 79 | Laura Stephens | 25 | | Lboro Uni | 4:12.00 |
| 8 | 77 | Jessica Smelt | 17 | | Repton | 4:14.70 |