| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 3 | Lucy Wall | 10 | Buxton | 57.85 |
| 3 | 5 | Ciorstaidh Smith | 13 | Buxton | 49.50 |
| 4 | 4 | A Montgomery-White | 11 | Buxton | 50.31 |
| 5 | 2 | Beau Burton | 10 | Buxton | 1:01.14 |
| 6 | 1 | Isla Pulvertaft | 9 | Buxton | 1:07.55 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Eva Sprenglewska | 13 | Buxton | 46.13 |
| 2 | 9 | Amelia Young | 15 | Buxton | 43.67 |
| 3 | 11 | Olivia Pope | 12 | Buxton | 41.01 |
| 4 | 10 | Mia Stokes | 14 | Buxton | 42.20 |
| 5 | 8 | Cloé De La Bertouche | 15 | Buxton | 45.60 |
| 6 | 6 | Ruby Ellis | 13 | Buxton | 46.50 |