EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Gracie Hudson | 13 | Ox & N Bucks | 1:10.76 |
| 1 | 4 | Bobbi Harper | 13 | Northants | 1:10.06 |
| 2 | 6 | Jessica Shaw | 13 | Cambs | 1:09.91 |
| 3 | 8 | Rachael Harris | 13 | Middlesex | 1:09.60 |
| 4 | 10 | Jori Horn | 13 | Scot West | 1:09.25 |
| 5 | 9 | Daisy Dewsbury | 13 | Berks&SBucks | 1:09.59 |
| 6 | 7 | Helena Hall | 13 | Suffolk | 1:09.80 |
| 7 | 5 | Jessica Owen | 13 | Leics | 1:09.93 |
| 8 | 3 | Isabella Vaughan | 12 | Surrey | 1:10.21 |
| 9 | 1 | Holly Johnson | 13 | Dorset | 1:11.58 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Drew Nelly McKenzie | 13 | Scot East | 1:07.95 |
| 1 | 14 | Jessica Lawton | 12 | Somerset | 1:06.80 |
| 2 | 16 | Isabel Iley | 13 | Essex | 1:06.23 |
| 3 | 18 | Lola Morales | 13 | N & Durham | 1:05.94 |
| 4 | 20 | Eva Okaro | 12 | Kent | 1:04.95 |
| 5 | 19 | Jessica Dickinson | 13 | Swim Wales W | 1:05.65 |
| 6 | 17 | Grace Conroy | 13 | Yorkshire | 1:06.04 |
| 7 | 15 | Hattie Varley | 13 | Lancashire | 1:06.51 |
| 8 | 13 | Josephine Klein | 13 | Devon | 1:07.08 |
| 9 | 11 | Arwen Stephens | 13 | Swim Wales E | 1:08.61 |