EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Glennon Lee | 13 | Essex | 1:19.82 |
| 1 | 4 | George Whittle | 13 | Derbyshire | 1:19.16 |
| 2 | 6 | Joshua Williams | 13 | Devon | 1:18.16 |
| 3 | 8 | Cameron Breedon | 13 | Notts | 1:17.41 |
| 4 | 10 | Leon Steer | 13 | Shropshire | 1:16.29 |
| 5 | 9 | James Annable | 13 | Northants | 1:17.22 |
| 6 | 7 | Alexander Cooper | 13 | Berks&SBucks | 1:17.71 |
| 7 | 5 | Rhys Insley | 13 | Somerset | 1:18.80 |
| 8 | 3 | Isaac Clare | 13 | Suffolk | 1:19.61 |
| 9 | 1 | Fraser Macintosh | 13 | Scot West | 1:21.22 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Alexander Corver | 13 | Kent | 1:15.90 |
| 1 | 14 | Thomas Wilkinson | 13 | Yorkshire | 1:14.60 |
| 2 | 16 | Alfie McGuire | 13 | N & Durham | 1:13.63 |
| 3 | 18 | Zain Lam | 13 | Surrey | 1:12.04 |
| 4 | 20 | Carwyn Jones | 13 | Swim Wales E | 1:10.92 |
| 5 | 19 | Edward Whittles | 13 | Middlesex | 1:11.83 |
| 6 | 17 | Matthew Charlesworth | 13 | Lancashire | 1:12.66 |
| 7 | 15 | Kayden Sillah | 13 | Ox & N Bucks | 1:14.41 |
| 8 | 13 | Matthew McMillan | 13 | Scot East | 1:15.06 |
| 9 | 11 | Ben Davidson | 13 | Cheshire | 1:16.20 |