EVENT 4 Girl Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Winter Morgan | 13 | Poole | 6:18.12 |
| 3 | 4 | Grace Montague | 13 | Poole | 6:08.15 |
| 4 | 6 | Eva Hourigan | 15 | S Bournem'th | 5:49.20 |
| 5 | 5 | Tamzin Harris | 15 | Poole | 5:59.94 |
| 6 | 3 | Erin McLean | 13 | Poole | 6:08.99 |
| 7 | 1 | Halle Robinson | 12 | Seagulls SC | 6:20.34 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Roberta Bryson | 13 | Poole | 5:42.84 |
| 2 | 10 | Natalia Baran | 15 | Poole | 5:41.22 |
| 3 | 12 | Bethany McWilliam | 15 | Seagulls SC | 5:35.65 |
| 4 | 14 | Harriet Fish | 17 | S Bournem'th | 5:31.42 |
| 5 | 13 | Lucy Steele | 18 | Poole | 5:33.40 |
| 6 | 11 | S Monera-Cabarique | 17 | Poole | 5:41.13 |
| 7 | 9 | Zoe Steele | 16 | Poole | 5:41.52 |
| 8 | 7 | Freya Coupe | 14 | Poole | 5:43.55 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Tilly McHugh | 16 | Poole | 5:24.16 |
| 2 | 18 | Jessica Huggins | 14 | Poole | 5:19.97 |
| 3 | 20 | Claudia Ashford | 18 | S Bournem'th | 5:10.59 |
| 4 | 22 | Amy Brown | 18 | S Bournem'th | 4:58.17 |
| 5 | 21 | Aimie Quarrie | 18 | Poole | 5:08.12 |
| 6 | 19 | Emily McWilliam | 17 | Seagulls SC | 5:11.46 |
| 7 | 17 | Catherine Eland | 18 | Poole | 5:24.09 |
| 8 | 15 | Mackenzi Ashford | 17 | S Bournem'th | 5:24.45 |