Heats (Declared Winners) Boys 12/13 Yrs 100m Butterfly
| Place | Name | AaD | Club | Time | | | 50 |
| 1. | Matthew POWELL | 13 | Surrey Co AS | 1:01.49 | | | 28.56 |
| 2. | Daniel JOHNSON | 13 | Northumb&Dur | 1:01.53 | | | 28.57 |
| 3. | Zach COURTNEY | 13 | Scotland Eas | 1:03.86 | | | 29.81 |
| 4. | Cynfelyn NANCARROW-LEI | 13 | South Wales | 1:03.99 | | | 30.21 |
| 5. | Bogac AYHAN | 13 | Middlesex Co | 1:04.33 | | | 29.92 |
| 6. | Ricky JONES | 13 | HertfordsASA | 1:04.72 | | | 30.07 |
| 7. | David MORGAN | 13 | Scotland Wes | 1:05.21 | | | 30.52 |
| 8. | Henry YOUNG | 12 | SussexCounty | 1:05.92 | | | 30.55 |
| 9. | Michael GUNNING | 13 | KentCounASA | 1:06.45 | | | 31.20 |
| 10. | Jack HOLLIS | 13 | Suffolk ASA | 1:06.77 | | | 30.38 |
| 10. | Cameron AUSTIN | 12 | Lancashire C | 1:06.77 | | | 31.13 |
| 12. | Ryan FLANAGAN | 13 | YorkshireASA | 1:06.99 | | | 32.25 |
| 13. | Kyle WALTON | 13 | Nottinghamsh | 1:07.46 | | | 31.76 |
| 14. | William REA | 12 | Berks&SBucks | 1:08.01 | | | 31.34 |
| 15. | Nick CONSTABLE | 13 | SomersetCoun | 1:08.63 | | | 32.09 |
| 16. | Charlie HAYES | 13 | EssexCounASA | 1:08.87 | | | 32.86 |
| 17. | Thomas MATTHEWS | 13 | Derbyshi ASA | 1:10.51 | | | 32.81 |
| 18. | Elliot BLOOR | 13 | CheshireCo | 1:11.72 | | | 32.22 |
| 19. | Michael HARRIS | 12 | Hampshire Co | 1:12.71 | | | 34.54 |
| 20. | Ryan KNOTT | 12 | DorsetCounty | 1:16.33 | | | 34.55 |
