EVENT 125 Boys 12/13 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Calum Rose | 13 | Scot East | 1:08.83 |
| 1 | 4 | JOSHUA SHAW | 13 | Surrey | 1:07.22 |
| 2 | 6 | Matthew Debenham | 13 | Suffolk | 1:07.18 |
| 3 | 8 | CHARLIE KALETHA | 13 | Leics | 1:06.90 |
| 4 | 10 | Cai Wardhaugh | 13 | Swim Wales E | 1:06.61 |
| 5 | 9 | Alessandro Rioda | 13 | Essex | 1:06.82 |
| 6 | 7 | Joshua Weston | 13 | Ox & N Bucks | 1:06.93 |
| 7 | 5 | Isaac Dodds | 13 | Hampshire | 1:07.20 |
| 8 | 3 | Joshua Crews | 13 | Cheshire | 1:07.25 |
| 9 | 1 | Isaac Ellis | 13 | Dorset | 1:12.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | DAVID O'LOUGHLIN | 13 | Devon | 1:05.90 |
| 1 | 14 | Cameron Gordon | 13 | Scot West | 1:05.30 |
| 2 | 16 | Ali Setterfield | 13 | Kent | 1:03.80 |
| 3 | 18 | Sam Cornish | 13 | Middlesex | 1:01.30 |
| 4 | 20 | Calvin Fry | 13 | Somerset | 1:00.00 |
| 5 | 19 | Ellis Cleworth | 13 | Lancashire | 1:00.40 |
| 6 | 17 | Elijah Kendrick | 13 | Sussex | 1:01.71 |
| 7 | 15 | Thomas English | 13 | N & Durham | 1:04.10 |
| 8 | 13 | Nathan Bunkle | 13 | Yorkshire | 1:05.60 |
| 9 | 11 | Dawid Sroka | 13 | Notts | 1:06.50 |