EVENT 236 Womens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 1 | Isabelle HEPBURN | 15 | Poole | 5:25.21 |
| 3 | 2 | Georgina LOCKE | 16 | Soundwell | 5:24.20 |
| 4 | 3 | Megan ADAMSON | 14 | Swindon Dolp | 5:23.24 |
| 5 | 4 | Flora PERKIN | 14 | Newton Abbot | 5:21.20 |
| 6 | 5 | Polly PAINTER | 15 | Millfield | 5:20.20 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 6 | Freya KING | 15 | Weston S M | 5:20.00 |
| 2 | 7 | Georgia GUSSEY | 13 | Co Bristol | 5:18.09 |
| 3 | 8 | Imogen MORONEY | 17 | Weston S M | 5:17.49 |
| 4 | 9 | Megan VINGOE | 15 | Carn Brea | 5:11.89 |
| 5 | 10 | Chloe PLATER | 17 | Mt Kelly | 5:11.40 |
| 6 | 11 | Charlotte EMERY | 14 | Exeter City | 5:11.00 |
| 7 | 12 | Lauren MATTHEWS | 20 | Swindon Dolp | 5:10.40 |
| 8 | 13 | Kiera NOON | 17 | Co Bristol | 5:09.70 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 15 | Aliyah-Mai WEBB | 17 | Exeter City | 5:07.11 |
| 2 | 17 | Lily BOOKER | 16 | Co Bristol | 4:58.19 |
| 3 | 19 | Laura STEPHENS | 18 | Plymouth Lea | 4:56.68 |
| 4 | 21 | Emily SIEBRECHT | 20 | Team Bath AS | 4:47.04 |
| 5 | 20 | Sophia WILSON | 16 | Millfield | 4:53.02 |
| 6 | 18 | Olivia BUTLER | 14 | Co Bristol | 4:57.60 |
| 7 | 16 | Annachiara BERNARDI | 17 | Mt Kelly | 5:01.21 |
| 8 | 14 | Molly FRANCIS | 16 | Mt Kelly | 5:09.30 |