EVENT 308 Womens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Eleanor HOLLIER | 15 | Co Bristol | 5:24.10 |
| 2 | 2 | Samantha HAMMOND | 15 | Team Bath AS | 5:23.59 |
| 3 | 3 | Maia CRUDGINGTON | 15 | Team Bath AS | 5:23.34 |
| 4 | 4 | Heather WITCOMBE | 15 | Soundwell | 5:22.00 |
| 5 | 5 | Teagan-Mae GRAHAM | 16 | Poole | 5:18.58 |
| 6 | 6 | Delphi EVANS | 15 | Severnside | 5:17.77 |
| 7 | 7 | Waris MILLS | 15 | Millfield | 5:16.50 |
| 8 | 8 | Georgina LOCKE | 16 | Soundwell | 5:14.74 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | Freya KING | 15 | Weston S M | 5:14.43 |
| 1 | 10 | Jorji LONGDON | 18 | Gloucester | 5:13.68 |
| 2 | 11 | Polly PAINTER | 15 | Millfield | 5:12.91 |
| 3 | 12 | Imogen MORONEY | 17 | Weston S M | 5:12.60 |
| 4 | 13 | Isabelle HEPBURN | 15 | S Bournem'th | 5:11.18 |
| 5 | 14 | Amy MILLS | 16 | Bourmth Coll | 5:10.43 |
| 6 | 15 | Aliyah-Mai WEBB | 17 | Exeter City | 5:08.46 |
| 7 | 16 | Emily EVELING | 15 | Mt Kelly | 5:08.07 |
| 8 | 17 | Megan VINGOE | 15 | Carn Brea | 5:06.91 |
| 9 | 18 | Jessica RICHENS | 18 | S Bournem'th | 5:06.06 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Kiera NOON | 17 | Co Bristol | 5:04.02 |
| 1 | 22 | Lauren MATTHEWS | 20 | Swindon Dolp | 5:03.03 |
| 2 | 24 | Christina MCDOWELL | 18 | Mt Kelly | 4:56.83 |
| 3 | 26 | Lily BOOKER | 16 | Co Bristol | 4:52.12 |
| 4 | 28 | Sophia WILSON | 16 | Millfield | 4:44.34 |
| 5 | 27 | Rachel ANDERSON | 15 | Millfield | 4:50.56 |
| 6 | 25 | Jasmine MCCREA | 16 | Poole | 4:54.67 |
| 7 | 23 | Abi RAWLINGS | 18 | Mt Kelly | 5:00.51 |
| 8 | 21 | Molly FRANCIS | 16 | Mt Kelly | 5:03.23 |
| 9 | 19 | Holly HUDGHTON | 16 | TauntonDeane | 5:04.03 |