EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 1 | Jessica Smith | 06 | Wiltshire | 1:14.61 |
| 2 | 3 | Charlotte Smith | 07 | Norfolk | 1:12.17 |
| 3 | 5 | Eleanor Bevan | 06 | Warwicks | 1:11.88 |
| 4 | 7 | Sophie Roberts | 06 | Cumbria | 1:11.21 |
| 5 | 6 | Eve Tinsley | 06 | Staffs | 1:11.32 |
| 6 | 4 | Kirsty Fuge | 06 | SE Herts | 1:11.93 |
| 7 | 2 | Evangeline Belt | 06 | Cornwall | 1:12.63 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 9 | Amy Knowles | 07 | Swim Wales W | 1:10.90 |
| 1 | 11 | Tilly McHugh | 06 | Dorset | 1:09.72 |
| 2 | 13 | Ella Thornburg | 06 | Sussex | 1:08.56 |
| 3 | 15 | Anna Uren | 06 | Gloucs | 1:07.46 |
| 4 | 17 | Matilda Ransome | 06 | Cambs | 1:06.82 |
| 5 | 16 | Olivia Newman-Baronius | 06 | Bedfordshire | 1:07.24 |
| 6 | 14 | Zara Beaumont | 06 | Worcs | 1:08.55 |
| 7 | 12 | Constance Phillips | 06 | Lincolnshire | 1:08.87 |
| 8 | 10 | Alexia Kowal | 06 | Leics | 1:09.90 |
| 9 | 8 | Paige Austin-Burrows | 06 | Hampshire | 1:11.00 |