EVENT 526 Womens 11/14 Yrs 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 2 | Lilly Davis | 12 | Co Peterboro | 5:55.95 |
| 2 | 4 | Amara Addison | 12 | Norwich Swan | 5:53.60 |
| 3 | 6 | Olivia Mahoney | 11 | Co Peterboro | 5:48.48 |
| 4 | 8 | Gracie Comitti | 12 | Basildon Ph | 5:45.96 |
| 5 | 7 | Lisa Leinemann | 12 | Chelmsford | 5:46.29 |
| 6 | 5 | Lexie Goodman | 12 | Basildon Ph | 5:52.42 |
| 7 | 3 | Lilly-Mae Kilbey | 12 | Epping For't | 5:54.70 |
| 8 | 1 | Megan Donovan | 12 | Co Peterboro | 5:56.11 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 10 | Romilly Marks | 13 | Newmarket | 5:44.00 |
| 2 | 12 | Skye Carter | 12 | Basildon Ph | 5:43.23 |
| 3 | 14 | Anna-Lucia Fenner | 13 | Basildon Ph | 5:42.50 |
| 4 | 16 | Sophie Dowding | 12 | teamipswich | 5:36.25 |
| 5 | 15 | Elijah Britton | 13 | St Felix Sch | 5:36.30 |
| 6 | 13 | Daisy Manning | 11 | Basildon Ph | 5:42.90 |
| 7 | 11 | Katy Lane | 13 | Co St Albans | 5:43.58 |
| 8 | 9 | Charlotte Shaw | 12 | Co Peterboro | 5:45.06 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 18 | Bella Parkus | 14 | Hoddesdon | 5:35.71 |
| 2 | 20 | Jessica Mahoney | 14 | Co Peterboro | 5:34.97 |
| 3 | 22 | Erica Charters | 14 | West Norfolk | 5:34.30 |
| 4 | 24 | Bryony Edgings | 14 | Thurrock | 5:33.27 |
| 5 | 23 | Sophie Fowler | 14 | C Beds SS | 5:33.86 |
| 6 | 21 | Emily Cutting | 14 | West Suffolk | 5:34.33 |
| 7 | 19 | Francesca Key | 14 | Canvey Isl | 5:35.01 |
| 8 | 17 | Charlotte Williams | 13 | Cheshunt | 5:36.21 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 26 | Elise Delapperall | 13 | Thurrock | 5:31.69 |
| 2 | 28 | Hannah Willis | 14 | Co Peterboro | 5:30.38 |
| 3 | 30 | Macy Dexter | 13 | Co Cambridge | 5:25.37 |
| 4 | 32 | Jessica Shaw | 14 | Co Peterboro | 5:23.12 |
| 5 | 31 | Olivia Newman-Baronius | 13 | Putteridge | 5:24.56 |
| 6 | 29 | Cait Cotter | 12 | Chelmsford | 5:29.61 |
| 7 | 27 | Olivia Cooper | 13 | Basildon Ph | 5:31.34 |
| 8 | 25 | Molly Grieve | 14 | Colchester | 5:33.08 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 34 | Leah Wightman | 14 | West Norfolk | 5:22.10 |
| 2 | 36 | Holly Lamb | 14 | Southend | 5:15.40 |
| 3 | 38 | Charlotte White | 14 | West Suffolk | 5:10.70 |
| 4 | 40 | Ruby Wheeler | 13 | Basildon Ph | 5:01.99 |
| 5 | 39 | Charlotte Norman | 14 | teamipswich | 5:10.63 |
| 6 | 37 | Matilda Ransome | 13 | Co Cambridge | 5:11.34 |
| 7 | 35 | Kiera Blunden | 14 | Chelmsford | 5:16.83 |
| 8 | 33 | Ruby Greenhalf | 14 | Co Norwich | 5:23.00 |