EVENT 401 Female 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Anissia Ioana TILEA | 10 | Co Sheffield | 8:20.00 |
| 4 | 3 | Anneliese CIRSTEA | 10 | Co Leeds | 7:00.00 |
| 5 | 2 | Isobel HARRISON | 10 | Co Sheffield | 7:10.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Lily HOGAN | 9 | Co Leeds | 6:54.04 |
| 2 | 6 | Gracie HART | 9 | Co Leeds | 6:45.00 |
| 3 | 8 | Martha NEWMAN | 9 | Co Leeds | 6:40.60 |
| 4 | 10 | Erika MARINOVA | 10 | Co Sheffield | 6:35.84 |
| 5 | 9 | Elizabeth ROTHWELL | 10 | Co Leeds | 6:40.00 |
| 6 | 7 | Sophia Xiu Hui KOK | 10 | Co Leeds | 6:41.54 |
| 7 | 5 | Matilda DARK | 9 | Co Leeds | 6:50.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Ayla CARRY | 11 | Co Leeds | 6:08.10 |
| 2 | 14 | Olive MITCHELL | 10 | Co Leeds | 6:06.50 |
| 3 | 16 | Florence WELCH | 13 | Cleethorpes | 6:00.00 |
| 4 | 18 | Faith BENSON | 15 | Bo Barnsley | 5:56.80 |
| 5 | 17 | Hannah SLADE | 12 | Chapeltown | 5:59.79 |
| 6 | 15 | Madeleine FLAHERTY | 11 | Co Leeds | 6:00.28 |
| 7 | 13 | Francesca SPALDING | 11 | Co Leeds | 6:07.80 |
| 8 | 11 | Eve HEPBURN-WOOD | 11 | Co Leeds | 6:28.67 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 20 | Beatrice CARROLL | 10 | Blackpool Aq | 5:52.80 |
| 2 | 22 | Rosie HAIGH | 12 | Co Sheffield | 5:24.36 |
| 3 | 24 | Ursula CARROLL | 12 | Stocksbridge | 5:11.39 |
| 4 | 26 | Emily MARRISON | 14 | Co Leeds | 4:59.67 |
| 5 | 25 | Ella JORDAN | 14 | Co Leeds | 5:06.61 |
| 6 | 23 | Grace FORD | 15 | Bo Barnsley | 5:22.30 |
| 7 | 21 | Katie SADLER | 10 | Co Leeds | 5:44.29 |
| 8 | 19 | Polly JESSOP | 12 | Co Sheffield | 5:55.48 |