Heats (Declared Winners) Boys 12/13 Yrs 100m Butterfly
| Place | Name | AaD | Club | Time | R.Time | | 50 |
| 1. | Jack Scott | 13 | Lancashire | 1:02.23 | + 0.79 | | 29.30 |
| 2. | Henry Young | 13 | Sussex | 1:02.68 | + 0.65 | | 29.64 |
| 3. | Mark Szaranek | 13 | Scot East | 1:03.42 | + 0.68 | | 30.71 |
| 4. | Leo Kelly-gee | 13 | Kent | 1:03.57 | + 0.75 | | 29.88 |
| 5. | Mathew Sleight | 13 | Yorkshire | 1:03.83 | + 0.77 | | 30.22 |
| 6. | Vincent De raucourt | 13 | Surrey | 1:04.48 | + 0.77 | | 30.00 |
| 7. | Tom Iles | 13 | Somerset | 1:05.07 | + 0.70 | | 31.06 |
| 8. | Ashley Ball | 13 | Hampshire | 1:05.31 | + 0.84 | | 30.64 |
| 9. | Michael Fernandes | 13 | Middlesex | 1:05.61 | + 0.90 | | 30.70 |
| 10. | Joshua Hobbs | 12 | N & Durham | 1:05.90 | + 0.71 | | 30.29 |
| 11. | Sam Pickford | 13 | Cheshire | 1:06.14 | + 0.83 | | 31.24 |
| 12. | William Rea | 13 | Berks&SBucks | 1:06.29 | + 0.77 | | 30.37 |
| 13. | George Clugston | 13 | Derbyshire | 1:06.74 | + 0.75 | | 30.25 |
| 14. | Samuel Williams | 13 | Staffs | 1:08.30 | + 0.85 | | 32.02 |
| 15. | Ellis Jeffrey | 13 | Leics | 1:08.40 | + 0.79 | | 31.83 |
| 16. | Harry Davies | 13 | South Wales | 1:09.49 | + 0.80 | | 32.13 |
| 17. | Mohammed Ahmed | 13 | Warwicks | 1:09.85 | + 0.73 | | 32.89 |
| 18. | Blair Davies | 13 | Herts | 1:11.46 | + 0.76 | | 32.32 |
| 19. | Joshua Coleby | 12 | Suffolk | 1:11.60 | + 0.82 | | 33.67 |
| 20. | Thomas Howitt | 13 | Wiltshire | 1:11.71 | + 0.98 | | 33.18 |
