Heats (Declared Winners) Boys 12/13 Yrs 100m Breaststroke
| Place | Name | AaD | Club | Time | | | 50 |
| 1. | Alex Murphy | 13 | Ox & N Bucks | 1:11.22 | | | 34.01 |
| 2. | Joseph Poynter | 13 | Dorset | 1:11.55 | | | 34.39 |
| 3. | Sean Houlihan | 13 | Essex | 1:14.30 | | | 34.62 |
| 4. | Daniel Graaf | 13 | Gloucs | 1:15.49 | | | 35.95 |
| 5. | Richard Jeffries | 13 | Cambs | 1:15.97 | | | 36.14 |
| 6. | Jed Snell | 13 | Norfolk | 1:16.36 | | | 35.38 |
| 7. | Jordan Coia | 13 | Scot North | 1:17.50 | | | 36.79 |
| 8. | David Middleton | 13 | Worcs | 1:17.54 | | | 36.40 |
| 9. | Lewis Wiley | 13 | Notts | 1:17.57 | | | 36.70 |
| 10. | Joshua Caton | 13 | Devon | 1:17.91 | | | 36.91 |
| 11. | Ikhuemose Ikhena | 13 | Lincolnshire | 1:18.06 | | | 37.75 |
| 12. | Jack Barker | 13 | Cumbria | 1:18.71 | | | 36.35 |
| 13. | Luke Hollis | 13 | Cornwall | 1:18.98 | | | 37.44 |
| 14. | Thomas Clarke | 13 | North Wales | 1:19.95 | | | 37.50 |
| 15. | Finlay Rae | 13 | Scot West | 1:20.22 | | | 37.96 |
| 16. | Robert Evans | 13 | Shropshire | 1:21.47 | | | 38.00 |
| 17. | Ross Morgan | 13 | Bedfordshire | 1:25.51 | | | 39.66 |
| 18. | Stuart Morris | 12 | Northants | 1:26.06 | | | 40.67 |
