EVENT 125 Boys 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 1 | Tristan Bowen | 06 | Cornwall | 1:18.11 |
| 2 | 3 | Dion Edwards | 07 | Swim Wales W | 1:11.60 |
| 3 | 5 | Max Parry | 06 | Cambs | 1:10.87 |
| 4 | 7 | Louis James | 06 | Norfolk | 1:10.16 |
| 5 | 6 | Jason Ho | 06 | SE Herts | 1:10.79 |
| 6 | 4 | Ethan Allpress | 06 | Cumbria | 1:11.56 |
| 7 | 2 | George De Voogt | 06 | Bedfordshire | 1:11.72 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 9 | Samuel Leveridge | 06 | Lincolnshire | 1:09.54 |
| 1 | 11 | William Edwards | 06 | Staffs | 1:08.92 |
| 2 | 13 | Luca Sartorius | 07 | Dorset | 1:08.18 |
| 3 | 15 | James McClure | 06 | Warwicks | 1:06.54 |
| 4 | 17 | Archie Thorman | 06 | Hampshire | 1:05.90 |
| 5 | 16 | Oliver Colombo | 06 | Sussex | 1:05.92 |
| 6 | 14 | David Annis | 06 | Worcs | 1:07.86 |
| 7 | 12 | Thomas Derbyshire | 06 | Leics | 1:08.86 |
| 8 | 10 | Jonathan Butt | 06 | Gloucs | 1:09.10 |
| 9 | 8 | Byron Robson | 06 | Wiltshire | 1:10.02 |