EVENT 308 Womens 400m Individual Medley - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Alesha GIBSON | 15 | Bourmth Coll | 5:27.80 |
| 2 | 2 | Eloise SUTTON | 15 | Aquae Sulis | 5:26.40 |
| 3 | 3 | Teagan-Mae GRAHAM | 15 | Poole | 5:25.70 |
| 4 | 4 | Holly HUDGHTON | 15 | Weston S M | 5:21.90 |
| 5 | 5 | Ella FARLEY | 16 | Exeter City | 5:20.40 |
| 6 | 6 | Rebecca COOK | 17 | TigersharksW | 5:20.00 |
| 7 | 7 | Aliyah-Mai WEBB | 16 | Exeter City | 5:19.50 |
| 8 | 8 | Rhiannon BOWEN | 15 | Aquae Sulis | 5:19.40 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | Rosie HOLLAND | 15 | Mt Kelly | 5:19.40 |
| 1 | 10 | Georgina LOCKE | 15 | Southwold | 5:17.50 |
| 2 | 11 | Bethan BLAKELOCK | 17 | Gloucester | 5:17.00 |
| 3 | 12 | Kiera NOON | 16 | Co Bristol | 5:16.90 |
| 4 | 13 | Josie SEARLE | 15 | Millfield | 5:15.90 |
| 5 | 14 | Abi RAWLINGS | 17 | Mt Kelly | 5:15.00 |
| 6 | 15 | Jasmine MCCREA | 15 | Poole | 5:15.00 |
| 7 | 16 | Amy MILLS | 15 | Bourmth Coll | 5:14.50 |
| 8 | 17 | Imogen MORONEY | 16 | Weston S M | 5:14.20 |
| 9 | 18 | Pixie LALE-KLASICKI | 20 | Soundwell | 5:13.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Thalia POAROS | 15 | Mt Kelly | 5:13.37 |
| 1 | 22 | Jessica PODGER | 15 | Co Bristol | 5:08.30 |
| 2 | 24 | Lauren MATTHEWS | 19 | Swindon Dolp | 5:07.40 |
| 3 | 26 | Charlotte SIMON | 18 | Plymouth Lea | 5:06.10 |
| 4 | 28 | Daniella WHITING | 19 | Aquae Sulis | 4:56.00 |
| 5 | 27 | Chloe EDRICH | 17 | Street | 5:00.50 |
| 6 | 25 | Lucy PEARCE | 19 | Co Bristol | 5:06.70 |
| 7 | 23 | Natasha ROGAN | 15 | Millfield | 5:07.70 |
| 8 | 21 | Molina SMALLEY | 18 | Plymouth Lea | 5:12.30 |
| 9 | 19 | Elizabeth BOOKER | 15 | Co Bristol | 5:13.44 |