| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Donald PERRIN | 10 | DOTT | 3:36.72 |
| 2 | 3 | Freya REED | 9 | DOTT | 4:23.55 |
| 3 | 2 | Ella GOODSWEN | 10 | DOTT | 3:28.94 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Sasha SPINKS | 11 | Diss Otters | 4:27.50 |
| 2 | 6 | Ella TOWNSEND | 11 | DOTT | 3:12.97 |
| 3 | 5 | Mya SIDWELL | 11 | DOTT | 3:49.03 |
| 4 | 4 | Ruby WELCH | 10 | DOTT | 4:26.09 |
| Heat Number - 3 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Laurie SHEARER | 11 | DOTT | 3:17.28 |
| 2 | 10 | Jon BARBER | 13 | DOTT | 2:59.46 |
| 3 | 9 | Grace COOK | 11 | DOTT | 3:22.63 |
| 4 | 7 | Eleanor GODBOLD | 12 | DOTT | 3:35.82 |