EVENT 101 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Imogen PATIS | 14 | Wellingboro | 7:20.00 |
| 2 | 4 | Phoebe DAVIS | 12 | Leic Sharks | 6:43.90 |
| 3 | 6 | Abigail TOMLINSON | 11 | Corby | 6:29.41 |
| 4 | 8 | Evie BRAMFORD | 13 | Hinckley | 6:17.10 |
| 5 | 7 | Isabelle PAWLOWSKI | 12 | Corby | 6:23.60 |
| 6 | 5 | Hollie SHIELLS | 11 | Leic Sharks | 6:30.00 |
| 7 | 3 | Trixie-May WRIGHT | 12 | Hinckley | 6:54.70 |
| 8 | 1 | Iris CARR | 11 | Hinckley | 7:21.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Faye MARTINOT | 13 | Wellingboro | 5:55.00 |
| 2 | 12 | Millie DAY | 16 | Wellingboro | 5:52.10 |
| 3 | 14 | Ellie CLARKE | 13 | Hinckley | 5:48.70 |
| 4 | 16 | Nika BUHHAROVA | 14 | Corby | 5:40.40 |
| 5 | 15 | Nicola JAMES | 52 | Market Har | 5:44.10 |
| 6 | 13 | Edith KABERRY | 13 | Corby | 5:49.10 |
| 7 | 11 | Ivy LOWE | 12 | Co Leicester | 5:53.01 |
| 8 | 9 | Riley WEBER | 11 | Corby | 6:13.89 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Lilly KOWAL | 13 | Wellingboro | 5:37.50 |
| 2 | 20 | Sophie LANE | 12 | Co Leicester | 5:35.48 |
| 3 | 22 | Ellie POULTON-BURBANK | 13 | Co Leicester | 5:30.65 |
| 4 | 24 | Lydia WARD | 15 | Newport Pag | 5:28.50 |
| 5 | 23 | Isabel HOLLYMAN | 19 | Wellingboro | 5:28.90 |
| 6 | 21 | Aaliyah BEETSON | 15 | Wellingboro | 5:33.50 |
| 7 | 19 | Jessica GILDER | 13 | Hinckley | 5:35.70 |
| 8 | 17 | Isabelle TANNER | 15 | Corby | 5:40.10 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Emilia DURRINGTON | 14 | Co Leicester | 5:22.20 |
| 2 | 28 | Marta UCIECHA | 14 | Co Leicester | 5:19.50 |
| 3 | 30 | Ava STEANS | 14 | Co Leicester | 5:15.60 |
| 4 | 32 | Nicola MICHALSKA | 13 | Co Leicester | 5:13.60 |
| 5 | 31 | Abigail GOLYNKER | 14 | Co Leicester | 5:14.10 |
| 6 | 29 | Freya SMYLIE | 14 | Newport Pag | 5:19.00 |
| 7 | 27 | Jessica GREENHALGH | 13 | Co Leicester | 5:21.50 |
| 8 | 25 | Emilie HIGGS | 14 | Newport Pag | 5:26.30 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Eleanor TRAHEARN | 15 | Hinckley | 5:13.00 |
| 2 | 36 | Phillippa CUTMORE | 12 | Corby | 5:12.43 |
| 3 | 38 | Florence SENIOR | 14 | Co Leicester | 5:10.50 |
| 4 | 40 | Matilda HANNAM | 13 | Newport Pag | 5:10.10 |
| 5 | 39 | Lily BARKER | 21 | Leic Sharks | 5:10.10 |
| 6 | 37 | Erika CLARKE | 13 | Co Leicester | 5:11.20 |
| 7 | 35 | Kaelyn COWE | 15 | Corby | 5:12.64 |
| 8 | 33 | Eva GALLAGHER | 15 | Corby | 5:13.56 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Heather ELRICK | 15 | Newport Pag | 5:04.40 |
| 2 | 44 | Harriet CASEY | 18 | Corby | 4:55.30 |
| 3 | 46 | Beau CUNNINGHAM | 15 | Corby | 4:46.90 |
| 4 | 48 | Lilly TAPPERN | 17 | Corby | 4:43.51 |
| 5 | 47 | Ella Mae PRIOR | 16 | Corby | 4:46.64 |
| 6 | 45 | Evie WOOD | 22 | Braunstone | 4:53.60 |
| 7 | 43 | Philippa BODEY | 13 | Co Leicester | 5:03.20 |
| 8 | 41 | Lea BROMWICH | 18 | Corby | 5:05.19 |