EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Maddison Tuer | 13 | Cumbria | 1:15.22 |
| 2 | 3 | Rachel Andrews | 13 | Bedfordshire | 1:14.00 |
| 3 | 5 | Esther Grigore | 13 | Northants | 1:11.40 |
| 4 | 7 | Leah Burgin-Rawson | 12 | Derbyshire | 1:11.00 |
| 5 | 6 | Millie Checkley | 13 | Worcs | 1:11.00 |
| 6 | 4 | Caitlyn Fry | 13 | Wiltshire | 1:11.55 |
| 7 | 2 | Issabelle Leigh | 13 | Cornwall | 1:14.29 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | Brenna Howell | 13 | Cambs | 1:10.22 |
| 1 | 11 | Chloe Harris | 12 | Staffs | 1:09.62 |
| 2 | 13 | Ruby Dagless | 12 | Norfolk | 1:08.40 |
| 3 | 15 | Olivia Lee | 13 | Berks&SBucks | 1:07.85 |
| 4 | 17 | Chloe Pritchard | 13 | Swim Wales W | 1:05.19 |
| 5 | 16 | Sophia Soteriou | 13 | Gloucs | 1:06.30 |
| 6 | 14 | Nadya Sterling | 13 | Warwicks | 1:08.20 |
| 7 | 12 | Lola Oke | 13 | Shropshire | 1:09.06 |
| 8 | 10 | Valeria Giron | 12 | Herts | 1:09.92 |
| 9 | 8 | Jemma Housego | 12 | Lincolnshire | 1:10.80 |