EVENT 338 Female 15 Yrs/Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Daisy Anton | 15 | Ripley | 5:29.60 |
| 4 | 3 | Sophie Gregory | 17 | Etwall | 5:27.50 |
| 5 | 2 | Darcie Willis | 17 | Eckington | 5:27.97 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Emily Bates | 16 | Chesterfield | 5:26.00 |
| 2 | 7 | Naomi Patton | 16 | Swadlincote | 5:23.70 |
| 3 | 9 | Jessica Wass | 16 | Derby Excel | 5:20.00 |
| 4 | 11 | Aydrian Cope | 15 | Ripley | 5:17.90 |
| 5 | 10 | Molly Hamblen | 15 | Etwall | 5:19.10 |
| 6 | 8 | Saffron Sands | 16 | Ripley | 5:23.45 |
| 7 | 6 | Ellie Rayner | 16 | Rykneld | 5:25.65 |
| 8 | 4 | Constance Simpson | 17 | Dronfield | 5:26.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 13 | Charlotte Lamb | 16 | Etwall | 5:08.60 |
| 1 | 15 | Mia Wilson | 16 | Long Eaton | 5:07.64 |
| 2 | 17 | Jessica Parry | 16 | Long Eaton | 5:06.10 |
| 3 | 19 | Matilda Hase | 17 | Long Eaton | 4:52.80 |
| 4 | 21 | Anna Tyers | 16 | Derby Excel | 4:33.50 |
| 5 | 20 | Lucy Cadden | 20 | Derby Excel | 4:35.00 |
| 6 | 18 | Abbie Tunnicliffe | 16 | Long Eaton | 4:52.98 |
| 7 | 16 | Rosie Stone | 17 | Ripley | 5:06.90 |
| 8 | 14 | Ella Bourne | 15 | Repton | 5:08.10 |
| 9 | 12 | Millie Cadden | 17 | Long Eaton | 5:09.60 |