EVENT 401 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Frankie LAMONT | 15 | Kettering | 7:18.00 |
| 3 | 3 | Nicola JAMES | 52 | Market Har | 6:50.00 |
| 4 | 5 | Marcie BLACKFORD | 14 | Corby | 6:38.22 |
| 5 | 4 | Millie DAY | 16 | Wellingboro | 6:46.30 |
| 6 | 2 | Georgina BEEBY | 13 | Kettering | 7:03.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Jessica GREENHALGH | 13 | Co Leicester | 6:27.20 |
| 2 | 9 | Jessica PURSER | 13 | Hinckley | 6:16.60 |
| 3 | 11 | Aaliyah BEETSON | 15 | Wellingboro | 6:13.50 |
| 4 | 13 | Emilia DURRINGTON | 14 | Co Leicester | 6:07.99 |
| 5 | 12 | Charlotte ELLIS | 14 | Daventry | 6:10.60 |
| 6 | 10 | Hannah MARSDEN | 14 | Daventry | 6:15.30 |
| 7 | 8 | Emilie HIGGS | 14 | Newport Pag | 6:21.00 |
| 8 | 6 | Kimberley HAYES | 13 | Kettering | 6:35.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Ava STEANS | 14 | Co Leicester | 6:05.70 |
| 2 | 17 | Eleanor TRAHEARN | 15 | Hinckley | 5:54.60 |
| 3 | 19 | Julia JOZWIAK | 16 | Leic Sharks | 5:45.10 |
| 4 | 21 | Alice STREETER | 18 | Market Har | 5:13.20 |
| 5 | 20 | Orla EYTON-JONES | 18 | Corby | 5:31.00 |
| 6 | 18 | Evie WOOD | 22 | Braunstone | 5:48.80 |
| 7 | 16 | Eva GALLAGHER | 15 | Corby | 6:01.21 |
| 8 | 14 | Phillippa CUTMORE | 12 | Corby | 6:06.40 |