EVENT 301 Women Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Annie McLeod | 14 | Putteridge | 5:25.28 |
| 2 | 3 | Romilly Marks | 16 | Newmarket | 5:23.52 |
| 3 | 5 | Sadie Hunter | 14 | Co Peterboro | 5:21.50 |
| 4 | 7 | Chloe Barnard | 13 | Basildon Ph | 5:13.30 |
| 5 | 6 | Katie Andrews | 18 | Norwich Swan | 5:14.60 |
| 6 | 4 | Molly Grieve | 17 | Colchester | 5:22.50 |
| 7 | 2 | Menna Walmsley | 18 | Co Cambridge | 5:25.06 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Daisy Manning | 14 | Basildon Ph | 5:10.95 |
| 2 | 11 | Hannah Willis | 17 | Co Peterboro | 5:07.43 |
| 3 | 13 | Matilda Ransome | 16 | Co Cambridge | 4:57.10 |
| 4 | 15 | Ruby Wheeler | 16 | Basildon Ph | 4:54.99 |
| 5 | 14 | Cait Cotter | 15 | Chelmsford | 4:55.70 |
| 6 | 12 | Beth Young | 16 | teamipswich | 5:07.19 |
| 7 | 10 | Isabella Porzio | 18 | Putteridge | 5:09.71 |
| 8 | 8 | Lilly Davis | 15 | Co Peterboro | 5:12.17 |