EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Harrison Aspinall | 13 | Shropshire | 1:25.28 |
| 2 | 3 | Max Turner | 13 | Lincolnshire | 1:22.04 |
| 3 | 5 | James Andrew | 13 | Wiltshire | 1:20.35 |
| 4 | 7 | Thomas Ogden | 13 | Herts | 1:18.75 |
| 5 | 6 | Luca Staines | 13 | Berks&SBucks | 1:20.30 |
| 6 | 4 | George Glover | 13 | Worcs | 1:21.90 |
| 7 | 2 | Harry Polkinghorne | 12 | Cornwall | 1:22.70 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | Bima Zulkarnaen | 13 | Staffs | 1:17.84 |
| 1 | 11 | John-Petre Vassilev-Nu | 13 | Derbyshire | 1:15.19 |
| 2 | 13 | Jack Smith | 13 | Cumbria | 1:13.46 |
| 3 | 15 | George Smith | 13 | Warwicks | 1:12.77 |
| 4 | 17 | Harvey Freeman | 13 | Northants | 1:09.50 |
| 5 | 16 | James Quinn | 13 | Cambs | 1:10.20 |
| 6 | 14 | Aneurin Davies | 13 | Swim Wales W | 1:13.22 |
| 7 | 12 | Samuel Taylor | 13 | Gloucs | 1:14.21 |
| 8 | 10 | Rhys Davidson | 13 | Bedfordshire | 1:16.16 |
| 9 | 8 | Olivier Vedrenne | 12 | Norfolk | 1:18.30 |