EVENT 122 Girls 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 1 | Abigail Farkas | 02 | Lincolnshire | 1:20.63 |
| 2 | 3 | Poppy Spanner | 03 | Staffs | 1:17.46 |
| 3 | 5 | Hannah Stephens | 03 | Cornwall | 1:17.07 |
| 4 | 7 | Millie Weeden | 03 | Sussex | 1:15.45 |
| 5 | 6 | Ellie-Mei Shepperson | 03 | Norfolk | 1:15.94 |
| 6 | 4 | Tutku Ciftci | 03 | Gloucs | 1:17.32 |
| 7 | 2 | Megan Adamson | 03 | Wiltshire | 1:18.31 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 9 | Ellie Matthews | 03 | Bedfordshire | 1:14.79 |
| 1 | 11 | Cerian Harries | 02 | Swim Wales W | 1:12.82 |
| 2 | 13 | Carys O'Reilly | 03 | Leics | 1:11.87 |
| 3 | 15 | Phoebe Kelman-Johns | 02 | Dorset | 1:11.27 |
| 4 | 17 | Charlotte Rigg | 02 | Warwicks | 1:09.21 |
| 5 | 16 | Amelia Monaghan | 02 | Cambs | 1:11.05 |
| 6 | 14 | Elizabeth Kingham | 02 | Worcs | 1:11.66 |
| 7 | 12 | Erin O\'Meara | 03 | SE Herts | 1:12.56 |
| 8 | 10 | Lucy Peers | 03 | Hampshire | 1:12.98 |
| 9 | 8 | Indya Sharp | 03 | Cumbria | 1:15.34 |