EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Evie Johnson | 12 | Notts | 1:10.26 |
| 1 | 4 | Blythe Kinsman | 12 | Devon | 1:08.82 |
| 2 | 6 | Brooke Illingworth | 13 | Shropshire | 1:08.49 |
| 3 | 8 | Ava Lambropoulos | 12 | Middlesex | 1:08.13 |
| 4 | 10 | Despoina Giannakaki | 12 | Ox & N Bucks | 1:07.77 |
| 5 | 9 | Matilda Bogle | 13 | Suffolk | 1:07.92 |
| 6 | 7 | Alice Mackie | 13 | Scot East | 1:08.28 |
| 7 | 5 | Stella McCardie | 13 | Scot West | 1:08.61 |
| 8 | 3 | Eja Coe | 13 | Derbyshire | 1:10.23 |
| 9 | 1 | Isabel Sharp | 13 | Northants | 1:12.73 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Jessica Pennifold | 13 | Lancashire | 1:07.10 |
| 1 | 14 | Naomi Parker | 13 | N & Durham | 1:06.44 |
| 2 | 16 | Alice Weston | 13 | Berks&SBucks | 1:05.56 |
| 3 | 18 | Lottie Roberts | 12 | Surrey | 1:04.59 |
| 4 | 20 | Eva Okaro | 13 | Kent | 1:03.29 |
| 5 | 19 | Jessica Lawton | 13 | Somerset | 1:03.85 |
| 6 | 17 | Isla Williams | 13 | Yorkshire | 1:05.20 |
| 7 | 15 | Erika Pasakinskaite | 13 | Essex | 1:06.12 |
| 8 | 13 | Millie Duncan | 13 | Cheshire | 1:06.66 |
| 9 | 11 | Phoebe Williams-Jones | 13 | Swim Wales E | 1:07.57 |