EVENT 125 Boys 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Rees Johnson | 13 | Staffs | 1:11.85 |
| 1 | 4 | Oscar Heald | 13 | Scot North | 1:10.54 |
| 2 | 6 | Owen Davies | 13 | Hampshire | 1:08.79 |
| 3 | 8 | William Gayne | 13 | Notts | 1:08.60 |
| 4 | 10 | David Murphy | 13 | Ox & N Bucks | 1:07.47 |
| 5 | 9 | Liam Cairns | 13 | Scot West | 1:08.06 |
| 6 | 7 | Christian McMillan | 13 | Essex | 1:08.70 |
| 7 | 5 | James Collyer | 13 | Scot East | 1:10.45 |
| 8 | 3 | Jake Duffy | 13 | N & Durham | 1:11.54 |
| 9 | 1 | Harrison Kemp | 12 | Dorset | 1:12.15 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Jamie Sharpley | 13 | Lancashire | 1:05.90 |
| 1 | 14 | Jacob Greenow | 13 | Somerset | 1:05.28 |
| 2 | 16 | Luke Hollingsworth | 13 | Berks&SBucks | 1:04.12 |
| 3 | 18 | Joseph Zlotnick | 13 | Middlesex | 1:03.50 |
| 4 | 20 | Jamie O'Connor | 13 | Kent | 1:01.90 |
| 5 | 19 | Liam Curran | 13 | Herts | 1:02.60 |
| 6 | 17 | Lewis Evers | 13 | Yorkshire | 1:03.80 |
| 7 | 15 | Daniel Johnson | 13 | Derbyshire | 1:04.50 |
| 8 | 13 | Nicholas Maini | 13 | Surrey | 1:05.57 |
| 9 | 11 | William Hutchin | 13 | Cheshire | 1:06.92 |