EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Ellie Pollock | 12 | Cornwall | 1:19.10 |
| 1 | 3 | Sasha Dyke | 13 | Norfolk | 1:15.35 |
| 2 | 5 | Rebecca Sherwin | 12 | Suffolk | 1:13.98 |
| 3 | 7 | Chloe Davies | 13 | Wiltshire | 1:12.84 |
| 4 | 9 | Lauren Doughty | 13 | Scot Midland | 1:11.27 |
| 5 | 8 | Laura Davison | 12 | Cumbria | 1:11.79 |
| 6 | 6 | Bethany Saunders | 13 | Northants | 1:13.80 |
| 7 | 4 | Zoe Griffiths | 13 | Bedfordshire | 1:14.35 |
| 8 | 2 | Lauren Holland | 13 | Shropshire | 1:16.93 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Chloe Barrow | 13 | Devon | 1:10.73 |
| 1 | 13 | Rebecca Dalling | 13 | Swim Wales W | 1:09.60 |
| 2 | 15 | Hannah Knight | 12 | Leics | 1:08.90 |
| 3 | 17 | Evie Reed | 13 | Gloucs | 1:07.60 |
| 4 | 19 | Tara Haworth | 13 | Lincolnshire | 1:06.60 |
| 5 | 18 | Katherine Brown | 13 | Cambs | 1:06.72 |
| 6 | 16 | Tazmin Pugh | 12 | Worcs | 1:07.72 |
| 7 | 14 | Bethan Connolly | 13 | Swim Wales E | 1:08.96 |
| 8 | 12 | Sophie Stables | 12 | Warwicks | 1:10.41 |
| 9 | 10 | Luiza Farache-Trajano | 13 | Sussex | 1:11.12 |