EVENT 105 Womens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 2 | Cara O'Toole | 16 | Hillingdon | 5:05.34 |
| 3 | 4 | Leah Schlosshan | 14 | Co Leeds | 5:04.98 |
| 4 | 6 | Isabelle Goodwin | 15 | Co Leeds | 5:03.94 |
| 5 | 5 | Issey-May Reeves | 15 | Co Sheffield | 5:04.07 |
| 6 | 3 | Ella Bainbridge | 15 | Cleethorpes | 5:05.07 |
| 7 | 1 | Carys O'Reilly | 16 | Co Leicester | 5:05.37 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 8 | Maisie Thornton | 16 | Brighton | 5:03.67 |
| 2 | 10 | Abbie Bowden | 17 | KingstonHull | 5:03.19 |
| 3 | 12 | Sophie Freeman | 15 | Plymouth Lea | 5:03.04 |
| 4 | 14 | Olivia Herron | 15 | Stockport Mo | 5:02.75 |
| 5 | 13 | Amy Corcoran | 17 | KingstonHull | 5:03.03 |
| 6 | 11 | Kidiest Hodgson | 15 | Co Leeds | 5:03.16 |
| 7 | 9 | Emma Dickson | 17 | Co Manch Aq | 5:03.41 |
| 8 | 7 | Ellie Reilly | 16 | Heart Of Mid | 5:03.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 16 | Lara Thomson | 14 | Co Leeds | 5:02.38 |
| 2 | 18 | Charlotte Rigg | 17 | Co Birm'ham | 5:02.00 |
| 3 | 20 | Sophie Barker | 18 | Co Sheffield | 5:01.57 |
| 4 | 22 | Martha Bradley | 15 | Co Leeds | 5:00.00 |
| 5 | 21 | Rebecca Sutton | 18 | Co Cardiff | 5:01.33 |
| 6 | 19 | Livia Kingsland | 14 | Nova Cent'n | 5:01.77 |
| 7 | 17 | Olivia Clare | 16 | Co Manch Aq | 5:02.13 |
| 8 | 15 | Iona Macleod | 16 | Dun City Aqu | 5:02.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 24 | Elizabeth Kingham | 17 | Co Birm'ham | 4:58.73 |
| 2 | 26 | Caitlin Mackay | 18 | Wycombe Dist | 4:58.60 |
| 3 | 28 | Ellie Turner | 16 | Carnegie | 4:58.01 |
| 4 | 30 | Betsy Wizard | 16 | Northampton | 4:56.12 |
| 5 | 29 | Yvonne Brown | 17 | Eastkilbride | 4:57.09 |
| 6 | 27 | Gaia Alcaras | 17 | Aberdeen Per | 4:58.25 |
| 7 | 25 | Tilly Hansen-Hamilton | 17 | Guildford Ct | 4:58.72 |
| 8 | 23 | Abigail Miles | 15 | Co Sheffield | 4:59.88 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 33 | Emma Day | 22 | Co Manch Aq | 4:54.61 |
| 2 | 37 | Rebecca Clynes | 17 | Co Leeds | 4:51.44 |
| 3 | 41 | Daisy Anderson | 18 | Thanet Swim | 4:50.23 |
| 4 | 45 | Hannah Miley | 30 | Aberdeen Per | 4:35.16 |
| 5 | 43 | Amy Bell | 19 | Co Sheffield | 4:46.57 |
| 6 | 39 | Michaella Glenister | 17 | Leic Sharks | 4:51.10 |
| 7 | 35 | Freya Colbert | 15 | Nova Cent'n | 4:54.32 |
| 8 | 31 | Mollie Wright | 21 | Nova Cent'n | 4:55.66 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 34 | Amber Keegan | 22 | Co Sheffield | 4:54.47 |
| 2 | 38 | Amelia Monaghan | 17 | Co Peterboro | 4:51.16 |
| 3 | 42 | Orla Adams | 24 | Aberdeen Per | 4:49.73 |
| 4 | 46 | Aimee Willmott | 26 | UniOfStirl | 4:34.90 |
| 5 | 44 | Abbie Wood | 20 | Loughboro NC | 4:40.55 |
| 6 | 40 | Katie Shanahan | 15 | Co Glasgow | 4:50.69 |
| 7 | 36 | Lily Booker | 18 | Millfield | 4:52.47 |
| 8 | 32 | Erin Davies | 16 | Co Birm'ham | 4:54.64 |