EVENT 509 Women Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 2 | Lily Herring | 14 | S10 | Norwich Swan | 6:12.50 |
| 3 | 4 | Meisha Trend-Evans | 16 | | Bishop Stort | 4:39.41 |
| 4 | 6 | Gabriela Gomez Pavon | 15 | | Potters Bar | 4:38.39 |
| 5 | 5 | Annie McLeod | 14 | | Putteridge | 4:38.80 |
| 6 | 3 | Abigail Wickens | 15 | S8 | Flitwick | 5:44.10 |
| 7 | 1 | Ida Corcoran | 13 | S9 | Flitwick | 7:00.95 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 8 | Ever Ives | 13 | | Hatfield | 4:38.10 |
| 2 | 10 | Sophie Dowding | 15 | | teamipswich | 4:32.92 |
| 3 | 12 | Adel Zakrzewski | 19 | | Co Norwich | 4:30.52 |
| 4 | 14 | Ruby Wheeler | 16 | | Basildon Ph | 4:23.20 |
| 5 | 13 | Cait Cotter | 15 | | Chelmsford | 4:24.70 |
| 6 | 11 | Francesca Baber | 16 | | Co Cambridge | 4:32.02 |
| 7 | 9 | Lucy Young | 17 | | Modernian | 4:37.30 |
| 8 | 7 | Olivia Fletcher | 19 | | Basildon Ph | 4:38.29 |