EVENT 124 Girls 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Jacqueline Knight | 13 | Hampshire | 1:12.78 |
| 1 | 4 | Inez Holliday | 13 | Scot North | 1:11.94 |
| 2 | 6 | Poppy Concannin | 13 | Ox & N Bucks | 1:09.84 |
| 3 | 8 | Isabella Woods | 13 | Kent | 1:09.20 |
| 4 | 10 | Abbie Wood | 13 | Derbyshire | 1:08.21 |
| 5 | 9 | Charlotte George | 13 | Surrey | 1:08.77 |
| 6 | 7 | Ellie Fogg | 13 | Herts | 1:09.30 |
| 7 | 5 | Hannah Drewett | 13 | Notts | 1:11.43 |
| 8 | 3 | Emily Osborne | 13 | Staffs | 1:12.53 |
| 9 | 1 | Georga Harrison | 12 | Dorset | 1:14.99 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Kirsty Armstrong | 13 | Scot East | 1:07.16 |
| 1 | 14 | Eve White | 13 | Scot West | 1:06.58 |
| 2 | 16 | Constance Dean | 13 | Berks&SBucks | 1:06.40 |
| 3 | 18 | Evan King | 13 | Somerset | 1:05.17 |
| 4 | 20 | Lucy Thornton | 13 | Middlesex | 1:03.70 |
| 5 | 19 | Holly Hibbott | 12 | Lancashire | 1:03.90 |
| 6 | 17 | Amelia Clynes | 13 | Yorkshire | 1:05.20 |
| 7 | 15 | Laura Stephens | 13 | Essex | 1:06.42 |
| 8 | 13 | Lauren Hodgson | 13 | N & Durham | 1:07.12 |
| 9 | 11 | Abbie Parton | 13 | Cheshire | 1:07.76 |