EVENT 301 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Isobel HARRISON | 10 | Co Sheffield | |
| 4 | 3 | Anissia Ioana TILEA | 10 | Co Sheffield | |
| 5 | 2 | Erika MARINOVA | 10 | Co Sheffield | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Evie-Rose TOPPING | 13 | Co Leeds | 5::51..3 |
| 2 | 5 | Sophie PEARCE | 12 | Co Sheffield | : . |
| 3 | 7 | Ella HARRISON | 11 | Co Leeds | : . |
| 4 | 9 | Arabella PEARCE | 12 | Cleethorpes | : . |
| 5 | 8 | Faith BENSON | 15 | Bo Barnsley | : . |
| 6 | 6 | Olive MITCHELL | 10 | Co Leeds | : . |
| 7 | 4 | Ayla CARRY | 11 | Co Leeds | : . |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Katie SADLER | 10 | Co Leeds | : . |
| 2 | 13 | Polly JESSOP | 12 | Co Sheffield | : . |
| 3 | 15 | Isla CUNDILL | 11 | Co Leeds | : . |
| 4 | 17 | Ezmae ALLEN | 12 | Co Sheffield | : . |
| 5 | 16 | Sophie MARSTON | 11 | Cleethorpes | : . |
| 6 | 14 | Verity LILLEY | 12 | Co Leeds | : . |
| 7 | 12 | Evie THORPE | 12 | Co Leeds | : . |
| 8 | 10 | Evie MORAN | 11 | Co Leeds | : . |