EVENT 210 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Olivia TAGG | 12 | Nova Cent'n | |
| 2 | 3 | Evie WEBSTER | 13 | Trafford Met | |
| 3 | 5 | Paige BAGSHAW | 14 | Nova Cent'n | |
| 4 | 7 | Amelie BRUNTLETT | 14 | Nuneaton | |
| 5 | 6 | Chloe JONES | 13 | LiverpoolPen | |
| 6 | 4 | Effie CHAPMAN | 13 | Nova Cent'n | |
| 7 | 2 | Anna MASON | 13 | Co Peterboro | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Jessica ROLLINGS | 14 | Co Leeds | |
| 1 | 11 | Erin BENTLEY | 14 | Co Leeds | |
| 2 | 13 | Amaja WATERS | 14 | Harrogate | |
| 3 | 15 | Addison CROPPER | 12 | Co Leeds | |
| 4 | 17 | Henrietta CHICK | 16 | Co Manch Aq | |
| 5 | 16 | Maisie MATTHEWS | 14 | Louth | |
| 6 | 14 | Florence DIXON | 14 | Co Leeds | |
| 7 | 12 | Rosie BROGDEN | 13 | Co Leeds | |
| 8 | 10 | Eliza DAVIES-MILLER | 14 | Co Birm'ham | |
| 9 | 8 | Ursula CARROLL | 13 | Stocksbridge | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 20 | Laura TUAN-MU | 15 | Co Birm'ham | |
| 1 | 25 | Kiera BINNS | 16 | Donc Dartes | |
| 2 | 29 | Isabel OWEN | 16 | Co Birm'ham | |
| 3 | 33 | Maisy SMITH | 20 | Stockport Mo | |
| 4 | 37 | Rhianna FOSTER | 19 | KingstonHull | |
| 5 | 35 | Lara TURNER | 20 | AJ Newcastle | |
| 6 | 31 | Olivia ANSTEY | 17 | Louth | |
| 7 | 27 | Ciara CUST | 18 | Conwy | |
| 8 | 22 | Vivien WILKINSON | 14 | Wirral Metro | |
| 9 | 18 | Emily INNS | 20 | Altrincham | |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 21 | Lilli-Ella CURRAN | 19 | AJ Newcastle | |
| 1 | 26 | Cazia MARTIN | 16 | Co Sheffield | |
| 2 | 30 | Poppy NUTTMAN | 15 | Bo Kirklees | |
| 3 | 34 | Mei YUASA | 15 | Co Leeds | |
| 4 | 38 | Katie REES | 27 | Swansea Uni | |
| 5 | 36 | Grace TURNER | 18 | Grantham | |
| 6 | 32 | Lacey GRAYSON | 17 | Rotherham Mo | |
| 7 | 28 | Emily TABERN | 15 | Warrington W | |
| 8 | 23 | Samantha TAYLOR | 14 | York City | |
| 9 | 19 | Francesca HALLAM-STOTT | 18 | Grantham | |