| Name | Age | School | Time | Splits | ||
| 1 | Charlotte Bryan | 15 | Wales | 1:03.83 | 29.70 | 1:03.83 |
| 2 | Lucy Charles | 16 | England | 1:04.40 | 30.00 | 1:04.40 |
| 3 | Sophie Brooks | 16 | England | 1:04.58 | 30.26 | 1:04.58 |
| 4 | Shauna O'Brien | 16 | Ireland | 1:05.96 | 30.62 | 1:05.96 |
| 5 | Amy Fraser | 15 | Scotland | 1:06.43 | 30.44 | 1:06.43 |
| 6 | Camiile Brash | 16 | Scotland | 1:06.64 | 30.73 | 1:06.64 |
| 7 | Seren Jones | 16 | Wales | 1:07.54 | 31.43 | 1:07.54 |
| 8 | India McGlynn | 16 | Ireland | 1:08.91 | 31.43 | 1:08.91 |