EVENT 211 Girls Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | M AZANA-BALL | 12 | Co Leeds | 5:53.13 |
| 2 | 4 | Holly HARRISON | 13 | Co Leeds | 5:40.57 |
| 3 | 6 | Martha SUMNALL | 13 | Co Liverpool | DN:C. |
| 4 | 8 | Erin JOHNSON | 14 | Nuneaton | DN:C. |
| 5 | 7 | Aira WILKINSON | 14 | Co Leeds | 5:42.19 |
| 6 | 5 | Olivia TAYLOR | 13 | Leamington | 5:47.81 |
| 7 | 3 | Isabelle HALL | 12 | Co Leeds | 5:40.42 |
| 8 | 1 | Florence DIXON | 12 | Co Leeds | 5:40.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 10 | Ella-Grace LAWSON | 14 | Warrington W | DN:C. |
| 1 | 12 | Isabel LLOYD | 15 | Wigan BEST | 5:28.14 |
| 2 | 14 | Isobel HITCHMOUGH | 14 | Warrington W | 5:30.73 |
| 3 | 16 | Emily WADE | 15 | Leyland Barr | 5:28.74 |
| 4 | 18 | Matilda ASHCROFT | 15 | Co Leeds | 5:18.32 |
| 5 | 17 | Alice HOLT | 14 | Wigan BEST | DN:C. |
| 6 | 15 | Mei YUASA | 13 | Co Leeds | 5:26.71 |
| 7 | 13 | Neve JONES | 17 | Nuneaton | 5:26.50 |
| 8 | 11 | Macy BARKER | 16 | Warrington W | 5:33.54 |
| 9 | 9 | Emily HALL | 13 | Warrington W | 5:38.08 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 21 | Francesca HALLAM-STOTT | 16 | Grantham | 5:24.63 |
| 1 | 25 | Lauren LILLEY | 15 | Co Leeds | 5:19.57 |
| 2 | 29 | Eve HORTON | 17 | Wigan BEST | 5:12.26 |
| 3 | 33 | Beatrice FINCH | 17 | South Lincs | 5:15.76 |
| 4 | 37 | Abbie ROSCOE | 14 | Wirral Metro | 5:01.32 |
| 5 | 35 | Hollie WILSON | 15 | Co Leeds | 5:05.92 |
| 6 | 31 | Isabel HANDLEY | 14 | Co Leeds | 5:19.08 |
| 7 | 27 | Payton CHESTERS | 15 | Warrington W | 5:16.05 |
| 8 | 23 | Kerry HENNIE | 15 | Warrington W | 5:24.38 |
| 9 | 19 | Elizabeth DIXON | 14 | Co Leeds | 5:31.06 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 22 | Evie HARRIS | 15 | Co Leeds | DN:C. |
| 1 | 26 | Gabriella HUNT | 15 | Warrington W | 5:22.42 |
| 2 | 30 | Matilda POTTER | 15 | Co Leeds | 5:09.75 |
| 3 | 34 | Evangeline STACEY | 16 | Co Leeds | 5:14.64 |
| 4 | 38 | Amelie BLOCKSIDGE | 14 | Co Salford | 4:59.51 |
| 5 | 36 | Mollie FISHER | 18 | Rotherham Mo | 5:17.66 |
| 6 | 32 | Olivia ANSTEY | 15 | Louth | DN:C. |
| 7 | 28 | Lily HORTON | 15 | Wirral Metro | 5:18.86 |
| 8 | 24 | Chloe RIDGE | 16 | Wigan BEST | 5:18.81 |
| 9 | 20 | Iris HURST | 13 | Warrington W | 5:31.35 |