| B Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 1 | Ciara CUST | 18 | Conwy | 1:09.42 |
| 1 | 2 | Emilia LESLIE | 17 | Stockport Mo | 1:08.89 |
| 2 | 3 | Ava CONNELL | 16 | Co Leeds | 1:08.50 |
| 3 | 4 | Olivia ANSTEY | 17 | Louth | 1:08.45 |
| 4 | 5 | Katherine NOBLE | 17 | Newcastle | 1:08.08 |
| 5 | 6 | Sophia SUGDEN | 15 | Co Manch Aq | 1:08.38 |
| 6 | 7 | Charlotte SOULSBY | 15 | Newcastle | 1:08.49 |
| 7 | 8 | Elizabeth DIXON | 16 | Co Leeds | 1:08.64 |
| 8 | 9 | Laura TUAN-MU | 15 | Co Birm'ham | 1:08.91 |
| 9 | 10 | Amit MALTZ | 15 | Harrogate | 1:09.69 |