Heats (Declared Winners) Boys 12/13 Yrs 100m Butterfly
| Place | Name | AaD | Club | Time | | | 50 |
| 1. | Lee Emmerson | 13 | Scot West | 1:02.87 | | | 29.39 |
| 2. | Thomas Mules | 12 | Dorset | 1:03.28 | | | 29.64 |
| 3. | Oliver Bitowt | 13 | Lincolnshire | 1:04.24 | | | 30.33 |
| 4. | Harry Payne | 13 | Essex | 1:06.43 | | | 31.21 |
| 5. | Ben Osborne | 13 | Cumbria | 1:09.06 | | | 32.29 |
| 6. | Jamie Beebee | 13 | Shropshire | 1:09.19 | | | 32.71 |
| 7. | Adam Van lokven | 12 | Ox & N Bucks | 1:09.28 | | | 32.53 |
| 8. | Alastair Miley | 13 | Scot North | 1:09.94 | | | 32.02 |
| 9. | Nick Ilsley | 13 | Cambs | 1:11.68 | | | 33.23 |
| 10. | Jack Laughland | 13 | Gloucs | 1:11.82 | | | 33.38 |
| 11. | Thomas Clarke | 13 | North Wales | 1:11.90 | | | 33.57 |
| 12. | Laurence Gummerson | 13 | Worcs | 1:12.40 | | | 33.68 |
| 13. | Alexander Shreeve | 13 | Norfolk | 1:12.61 | | | 33.82 |
| 14. | George Humphrey | 13 | Devon | 1:12.62 | | | 33.68 |
| 14. | Andrew Ward | 13 | Northants | 1:12.62 | | | 33.59 |
| 16. | Thomas Lambert | 13 | Bedfordshire | 1:12.84 | | | 34.08 |
| 17. | Jobe Harriss | 12 | Cornwall | 1:16.39 | | | 34.69 |
| Jorge Phenix-coyne | 13 | Notts | DQ | T-3L | | |
Disqualification Codes
