EVENT 301 Women Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Menna Walmsley | 17 | Team Luton | 5:28.58 |
| 2 | 4 | Kirsty Neill | 14 | Bishop Stort | 5:26.59 |
| 3 | 6 | Hollie Hawkins | 14 | Basildon Ph | 5:25.51 |
| 4 | 8 | Cait Cotter | 14 | Chelmsford | 5:22.50 |
| 5 | 7 | Elise Delapperall | 15 | Thurrock | 5:24.31 |
| 6 | 5 | Isabella Porzio | 17 | Putteridge | 5:25.97 |
| 7 | 3 | Lucinda Stanley | 17 | Harpenden | 5:28.00 |
| 8 | 1 | Sophie Dowding | 14 | teamipswich | 5:29.68 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Lily Bemmer | 18 | Deben | 5:19.15 |
| 2 | 12 | Charlotte Tree | 17 | Colchester | 5:17.69 |
| 3 | 14 | Hannah Willis | 16 | Co Peterboro | 5:17.22 |
| 4 | 16 | Madelyn Latimer-Hicks | 17 | St Felix Sch | 5:14.21 |
| 5 | 15 | Daisy Manning | 13 | Basildon Ph | 5:15.55 |
| 6 | 13 | Leah Wightman | 16 | West Norfolk | 5:17.30 |
| 7 | 11 | Francesca Key | 16 | Thurrock | 5:18.82 |
| 8 | 9 | Jessica Mahoney | 16 | Co Peterboro | 5:20.91 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Matilda Ransome | 15 | Co Cambridge | 5:05.50 |
| 2 | 20 | Charlotte White | 16 | West Suffolk | 5:04.00 |
| 3 | 22 | Harriet Salisbury | 17 | Co Peterboro | 5:00.56 |
| 4 | 24 | Natalie Sanford | 17 | St Felix Sch | 4:56.58 |
| 5 | 23 | Ruby Wheeler | 15 | Basildon Ph | 4:58.90 |
| 6 | 21 | Ellie O'Keeffe | 21 | Co Cambridge | 5:03.48 |
| 7 | 19 | Matilda Bogle | 15 | teamipswich | 5:04.50 |
| 8 | 17 | Ciara Wookey | 17 | Colchester | 5:10.32 |