EVENT 401 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Evie COOK | 10 | Co Leeds | 7:32.40 |
| 2 | 3 | Verity LILLEY | 11 | Co Leeds | 7:18.40 |
| 3 | 5 | Neve STAFFORD | 10 | Co Leeds | 6:59.20 |
| 4 | 7 | Savannah FOSTER | 12 | Scarborough | 6:43.60 |
| 5 | 6 | Sarah MILLINGTON | 12 | Bo Kirklees | 6:50.60 |
| 6 | 4 | Emilia KEEFE | 10 | Co Wakefield | 7:00.00 |
| 7 | 2 | Judy MOHAMED | 10 | Co Leeds | 7:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Zoe FEATHER | 10 | Co Leeds | 6:37.70 |
| 1 | 11 | Tylan FLETCHER | 14 | Co Leeds | 6:20.64 |
| 2 | 13 | Paige BORLAND | 12 | Bo Kirklees | 6:18.40 |
| 3 | 15 | Sophia GRAVILLE | 11 | Co Leeds | 6:14.00 |
| 4 | 17 | Elise BURMAN | 13 | Blackpool Aq | 6:09.30 |
| 5 | 16 | Jessica ROLLINGS | 11 | Co Leeds | 6:09.40 |
| 6 | 14 | Eva SYLVESTER | 11 | Co Leeds | 6:18.20 |
| 7 | 12 | Freya ELLIS | 11 | Co Leeds | 6:19.70 |
| 8 | 10 | Amelia MATSON | 11 | Co Leeds | 6:32.00 |
| 9 | 8 | Sophie MARSTON | 10 | Scunthorpe A | 6:38.15 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Evie-Rose TOPPING | 12 | Co Leeds | 6:07.30 |
| 1 | 21 | Chloe WHITTINGTON | 13 | Preston | 6:02.00 |
| 2 | 23 | Emily ENGLAND-HALL | 11 | Co Leeds | 5:56.40 |
| 3 | 25 | Bonnie CARRUTHERS | 13 | Ramsbottom | 5:48.81 |
| 4 | 27 | Ruby ELLIS | 15 | Co Leeds | 5:47.20 |
| 5 | 26 | Erin BENTLEY | 12 | Co Leeds | 5:48.10 |
| 6 | 24 | Sophia HEWINGS | 14 | Co Wakefield | 5:54.90 |
| 7 | 22 | Aimee KEEFE | 13 | Co Wakefield | 5:56.80 |
| 8 | 20 | Ava BRADLEY | 13 | Co Leeds | 6:03.81 |
| 9 | 18 | Elizabeth BOND | 11 | Co Leeds | 6:07.40 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Pollyanna KERSHAW | 13 | Blackpool Aq | 5:42.03 |
| 1 | 31 | Florence DIXON | 12 | Co Leeds | 5:35.90 |
| 2 | 33 | Elkie FOSTER | 12 | Co Leeds | 5:31.70 |
| 3 | 35 | Robyn HOWARD | 13 | Co Leeds | 5:29.20 |
| 4 | 37 | Charlotte MULLARKEY | 17 | Co Salford | 5:21.20 |
| 5 | 36 | S HUTCHINSON THOMPSON | 15 | Co Salford | 5:24.40 |
| 6 | 34 | Rose KEEFE | 15 | Co Wakefield | 5:31.60 |
| 7 | 32 | Amelia MOSS | 17 | Ramsbottom | 5:32.00 |
| 8 | 30 | Honor LUCKHURST | 14 | Preston | 5:37.80 |
| 9 | 28 | Annabel GALBRAITH | 13 | Co Leeds | 5:46.50 |