| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Evalyn-Angel WAKEHAM | 12 | Wisbech | 3:54.30 |
| 4 | 3 | Maisie BISHOP | 12 | Wisbech | 3:24.50 |
| 5 | 2 | Mariette EVANS | 19 | Wisbech | 3:51.80 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Isabelle PAWLOWSKI | 13 | Corby | 3:13.60 |
| 2 | 7 | Georgia PARKER | 14 | Corby | 3:05.17 |
| 3 | 9 | Elisa GIRAUD | 13 | Corby | 2:45.70 |
| 4 | 11 | Lilly TAPPERN | 18 | Corby | 2:28.00 |
| 5 | 10 | Rowan WHITE | 17 | Rushden | 2:39.30 |
| 6 | 8 | Isabella BURTON | 16 | Wisbech | 2:54.00 |
| 7 | 6 | Niamh O'DONOGHUE | 14 | March | 3:10.10 |
| 8 | 4 | Holly SMITH | 13 | Wisbech | 3:20.00 |