EVENT 124 Female 12/13 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Lexie Sandiford | 12 | Bedfordshire | 1:15.06 |
| 2 | 3 | Daisy Berry | 13 | Shropshire | 1:14.38 |
| 3 | 5 | Sophie Cooksey | 13 | Lincolnshire | 1:13.99 |
| 4 | 7 | Mali Roberts | 13 | SW Wales | 1:13.30 |
| 5 | 6 | Layla Wareing | 12 | Dorset | 1:13.84 |
| 6 | 4 | Orna Lett | 13 | Northants | 1:14.35 |
| 7 | 2 | Maisie O'Mahony | 13 | Cumbria | 1:14.51 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Evie Greenhalf | 13 | Norfolk | 1:11.84 |
| 1 | 11 | Betina Puszkarska | 13 | Wiltshire | 1:11.61 |
| 2 | 13 | Akemi Futatsugi | 13 | Gloucs | 1:09.98 |
| 3 | 15 | Janie Finch | 13 | Leics | 1:08.67 |
| 4 | 17 | Iris Hurst | 13 | Cheshire | 1:05.22 |
| 5 | 16 | Kalila Smith | 13 | Scot North | 1:08.15 |
| 6 | 14 | Megan Daniel | 13 | Cornwall | 1:09.10 |
| 7 | 12 | Ivy Manning | 13 | Ox & N Bucks | 1:11.30 |
| 8 | 10 | Macey Brough | 12 | Staffs | 1:11.80 |
| 9 | 8 | Kitty Lamb | 12 | Cambs | 1:12.93 |