EVENT 107 Female 16/17 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Molly Watts | 16 | Wiltshire | 1:11.21 |
| 2 | 3 | Bethany Hamer | 16 | Bedfordshire | 1:09.97 |
| 3 | 5 | Charlotte Smart | 16 | SW Wales | 1:09.23 |
| 4 | 7 | Grace Turner | 16 | Lincolnshire | 1:08.68 |
| 5 | 6 | Megan Cumner | 16 | Cornwall | 1:09.08 |
| 6 | 4 | Scarlet Tinwell | 16 | Staffs | 1:09.78 |
| 7 | 2 | Francesca Davies | 17 | Shropshire | 1:10.63 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Alice Streeter | 17 | Leics | 1:06.24 |
| 1 | 11 | Isobel Mather | 16 | Cambs | 1:05.17 |
| 2 | 13 | Annabelle Quinn | 17 | Ox & N Bucks | 1:04.16 |
| 3 | 15 | Anna Uren | 17 | Gloucs | 1:03.36 |
| 4 | 17 | Sophie Weston | 17 | Cheshire | 1:01.99 |
| 5 | 16 | Amara Addison | 16 | Norfolk | 1:02.84 |
| 6 | 14 | Halle Harris | 16 | Dorset | 1:03.74 |
| 7 | 12 | Maria Luiza Howe | 16 | Scot North | 1:04.98 |
| 8 | 10 | Millie Sandham | 17 | Cumbria | 1:06.23 |
| 9 | 8 | Emilia Cieszczyk | 16 | Northants | 1:06.70 |