EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Poppy Cordell Thompson | 13 | Dorset | 1:13.40 |
| 1 | 4 | Olivia Round-Pitman | 13 | Sussex | 1:09.95 |
| 2 | 6 | Lydia Parker | 13 | Hampshire | 1:08.74 |
| 3 | 8 | Safia Button | 13 | Suffolk | 1:08.44 |
| 4 | 10 | Tamryn Van Selm | 13 | Kent | 1:06.90 |
| 5 | 9 | Olivia Katory | 13 | N & Durham | 1:07.10 |
| 6 | 7 | Lottie James | 13 | Ox & N Bucks | 1:08.71 |
| 7 | 5 | Madelaine Parkinson | 13 | Cheshire | 1:09.40 |
| 8 | 3 | Emma Erskine | 13 | Notts | 1:10.90 |
| 9 | 1 | Iona Wilson | 13 | Scot East | 1:14.34 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | LIBBY HARRIS | 13 | Surrey | 1:06.80 |
| 1 | 14 | Sophie Freeman | 13 | Essex | 1:06.34 |
| 2 | 16 | Skye McLaughlin | 13 | Somerset | 1:05.40 |
| 3 | 18 | Olivia Herron | 13 | Lancashire | 1:04.30 |
| 4 | 20 | Lucy Grieve | 13 | Scot West | 1:02.50 |
| 5 | 19 | Rebecca De Torres | 13 | Swim Wales E | 1:02.54 |
| 6 | 17 | Ella Bainbridge | 13 | Yorkshire | 1:04.80 |
| 7 | 15 | ORIANA NOEL | 13 | Devon | 1:06.20 |
| 8 | 13 | Jo Hobsley | 13 | Middlesex | 1:06.40 |
| 9 | 11 | YASMINE SHEFFIELD | 13 | Leics | 1:06.90 |