EVENT 401 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 1 | Jasmine CRAM | 13 | Borocuda T | : . |
| 1 | 3 | Elora STORR | 9 | Borocuda T | : . |
| 2 | 5 | Amelia BANNON | 10 | Camden Swiss | : . |
| 3 | 7 | Sana SINGH | 10 | Camden Swiss | : . |
| 4 | 9 | Francesca WILKINSON | 9 | Co Leeds | : . |
| 5 | 8 | Darcy PENNINGTON | 10 | Co Leeds | : . |
| 6 | 6 | Annabeth CHEUNG | 9 | Co Leeds | : . |
| 7 | 4 | Grace ROWNTREE | 11 | Borocuda T | : . |
| 8 | 2 | Felicity WATSON | 11 | Borocuda T | : . |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 11 | Marcie GREEF | 11 | Chester Le S | : . |
| 1 | 13 | Isla MCCARRON | 10 | Chester Le S | : . |
| 2 | 15 | Lola MALCOLM | 9 | Co Leeds | : . |
| 3 | 17 | Heidi EGGLESTON | 11 | Borocuda T | : . |
| 4 | 19 | Scarlett MACARTHY | 11 | Chester Le S | : . |
| 5 | 18 | A STANISZEWSKA-SCONTUS | 11 | Co Leeds | : . |
| 6 | 16 | Sienna BOUSFIELD-EVANS | 10 | Settle Srays | : . |
| 7 | 14 | Niamh SUTCLIFFE | 10 | Co Leeds | : . |
| 8 | 12 | Helen PLEGA | 10 | Camden Swiss | : . |
| 9 | 10 | Pixie GRAHAM | 9 | Settle Srays | : . |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 21 | Sophia TALBOT | 12 | Chester Le S | : . |
| 1 | 23 | Harper ELLIS | 10 | Co Leeds | : . |
| 2 | 25 | Olivia HAN | 10 | Co Leeds | : . |
| 3 | 27 | Lucie SAWH | 10 | Camden Swiss | : . |
| 4 | 29 | Matilde OLINS | 11 | Camden Swiss | : . |
| 5 | 28 | Eleanora HAYWARD | 10 | Camden Swiss | : . |
| 6 | 26 | Sophia OZERSKY | 11 | Camden Swiss | : . |
| 7 | 24 | Arina MIHAILOVA | 10 | Co Leeds | : . |
| 8 | 22 | G BOUSFIELD-EVANS | 12 | Settle Srays | : . |
| 9 | 20 | Isabelle DINSDALE | 12 | Chester Le S | : . |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 31 | Gracie HART | 10 | Co Leeds | : . |
| 1 | 33 | Layla WOODHEAD | 14 | Chester Le S | : . |
| 2 | 35 | Imogen BURFORD | 11 | Chester Le S | : . |
| 3 | 37 | Charlize SCHNEIDER | 11 | Co Leeds | : . |
| 4 | 39 | India EDWARDS | 11 | Co Liverpool | : . |
| 5 | 38 | Lily HOGAN | 10 | Co Leeds | : . |
| 6 | 36 | Georgina CRAM | 11 | Borocuda T | : . |
| 7 | 34 | Jessica MCMAHON | 11 | Chester Le S | : . |
| 8 | 32 | Hollie GRADON | 12 | Chester Le S | : . |
| 9 | 30 | Stella BOWES | 9 | Co Leeds | : . |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 41 | Yulia MIGITA | 11 | Camden Swiss | : . |
| 1 | 43 | Caitlin WATSON | 15 | Borocuda T | : . |
| 2 | 45 | Matilda DARK | 10 | Co Leeds | : . |
| 3 | 47 | Isla GRIMSHAW | 13 | Workington | : . |
| 4 | 49 | Isabella MCCARRON | 14 | Chester Le S | : . |
| 5 | 48 | Sophia Xiu Hui KOK | 11 | Co Leeds | : . |
| 6 | 46 | Daisy GLOVER | 14 | Co Leeds | : . |
| 7 | 44 | Bella GLENCROSS | 14 | Workington | : . |
| 8 | 42 | Mia LEIGHTON | 12 | Rotherham Mo | : . |
| 9 | 40 | Ellina BAHDANIONAK | 11 | Camden Swiss | : . |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 51 | Martha NEWMAN | 10 | Co Leeds | : . |
| 1 | 53 | Keira ENIKEEVA | 11 | Camden Swiss | : . |
| 2 | 55 | Alana RANKIN | 12 | Co Leeds | : . |
| 3 | 57 | Jagoda JAKUBIEC | 12 | Camden Swiss | : . |
| 4 | 59 | Nieve STEVENSON | 16 | Chester Le S | : . |
| 5 | 58 | Erica BANCROFT | 13 | Chester Le S | : . |
| 6 | 56 | Naomi DAL | 12 | Camden Swiss | : . |
| 7 | 54 | Matilda SHERLEY-PRICE | 10 | Co Leeds | : . |
| 8 | 52 | Elizabeth ROTHWELL | 11 | Co Leeds | : . |
| 9 | 50 | Defne DEGIRMENCI | 12 | Camden Swiss | : . |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 61 | Jinglan HUANG | 11 | Camden Swiss | : . |
| 1 | 63 | Allison LIAW | 12 | Camden Swiss | : . |
| 2 | 65 | Bailey GRAHAM | 13 | Settle Srays | : . |
| 3 | 67 | Lola BURNETT | 14 | Scunthorpe A | : . |
| 4 | 70 | Annabel GALBRAITH | 15 | Co Leeds | : . |
| 5 | 69 | Evie COOK | 12 | Co Leeds | : . |
| 6 | 66 | Amelie SIDHU-BEVAN | 13 | Camden Swiss | : . |
| 7 | 64 | Anna GORDIENKO | 11 | Camden Swiss | : . |
| 8 | 62 | Matilda KING | 12 | Camden Swiss | : . |
| 9 | 60 | Evie MORAN | 12 | Co Leeds | : . |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 72 | Maya HIGGINS | 12 | Scunthorpe A | : . |
| 1 | 75 | Charlotte BARNARD | 15 | Camden Swiss | : . |
| 2 | 77 | Rosie BACKHOUSE | 12 | Scunthorpe A | : . |
| 3 | 79 | Ella BANKS | 16 | Welshpool | : . |
| 4 | 81 | Anya BABOVIC | 13 | Chester Le S | : . |
| 5 | 80 | Lily DAVIDSON | 18 | Chester Le S | : . |
| 6 | 78 | Keira OSORIO | 17 | Camden Swiss | : . |
| 7 | 76 | Jessica COLLEY | 12 | Co Leeds | : . |
| 8 | 73 | Valerie SHMANEVA | 12 | Camden Swiss | : . |
| 9 | 71 | Nok Ching CHAN | 13 | Camden Swiss | : . |