EVENT 301 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 1 | Shanice WOOD | 16 | Seagulls SC | 10:05.59 |
| 3 | 3 | Olivia UZAL WILSON | 13 | Seagulls SC | 6:52.34 |
| 4 | 2 | Lucy KEEPING | 15 | Bridport Bar | 7:19.46 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 5 | Grace PALMER | 12 | West Dorset | 6:41.40 |
| 2 | 7 | Sasha WOOD | 15 | Seagulls SC | 6:29.39 |
| 3 | 9 | Matilda NEWPORT | 13 | Weymouth | 6:27.80 |
| 4 | 8 | Sofia RAINALDI | 13 | S Bournem'th | 6:28.77 |
| 5 | 6 | Lauren STRUCK | 12 | S Bournem'th | 6:37.24 |
| 6 | 4 | Emily COLLINS | 15 | Poole | 6:44.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 11 | Elizabeth WILTSHIRE | 12 | West Dorset | 6:01.98 |
| 2 | 13 | Daisy WIGGINS | 13 | S Bournem'th | 5:50.87 |
| 3 | 15 | Emilia DETRICK | 13 | S Bournem'th | 5:40.39 |
| 4 | 14 | Ava-Mae MATTOCKS | 09 | N Dorset SC | 5:45.93 |
| 5 | 12 | Zelie LONG | 09 | Wareham | 5:58.73 |
| 6 | 10 | Millie HENNESSY | 13 | Poole | 6:20.97 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 17 | Faith PIRUS | 08 | Bridport Bar | 5:23.92 |
| 2 | 19 | Siena GADD | 11 | Seagulls SC | 5:19.52 |
| 3 | 21 | Mollie-Zena GREGORY | 08 | S Bournem'th | 4:54.40 |
| 4 | 20 | Emelia BAYBUTT | 11 | Bridport Bar | 5:05.21 |
| 5 | 18 | Faye STAMATAKIS | 11 | S Bournem'th | 5:21.05 |
| 6 | 16 | Isabelle MACRAE | 11 | S Bournem'th | 5:26.80 |