| B Final | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 1 | Rosie WHITTEN | 07 | Swim Belfast | 29.50 |
| 2 | 2 | Erin RIORDAN | 99 | NC Dublin | 29.29 |
| 3 | 3 | Grace CONROY | 05 | Repton | 29.02 |
| 4 | 4 | Paige FENTON | 03 | Loughboro Un | 28.97 |
| 5 | 5 | Leah SCHLOSSHAN | 05 | Co Leeds | 29.02 |
| 6 | 6 | Mollie GARRATT | 04 | Co Manch Aq | 29.15 |
| 7 | 7 | Sophie TRAILL | 07 | Stockport Mo | 29.40 |
| 8 | 8 | Asma LE FALHER | 05 | Lboro Uni | 29.78 |