EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 2 | Ross Neally | 00 | Scot East | 1:22.17 |
| 1 | 4 | Ken Ho | 00 | Worcs | 1:19.61 |
| 2 | 6 | Miles Clark | 00 | Middlesex | 1:18.30 |
| 3 | 8 | Henry Offin | 00 | Surrey | 1:17.84 |
| 4 | 10 | Rhys Taylor | 00 | Notts | 1:17.47 |
| 5 | 9 | Nathan Corrigan | 00 | Hampshire | 1:17.48 |
| 6 | 7 | Joseph Martin | 00 | N & Durham | 1:17.86 |
| 7 | 5 | Archy Burnell | 99 | Sussex | 1:19.04 |
| 8 | 3 | Ben Johnstone | 99 | Scot West | 1:21.25 |
| 9 | 1 | Dan Elkin | 00 | Somerset | 1:22.59 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 12 | George Manser | 99 | Ox & N Bucks | 1:15.07 |
| 1 | 14 | Joshua Horobin | 99 | Derbyshire | 1:14.04 |
| 2 | 16 | Kenan Yeung | 00 | Lancashire | 1:13.01 |
| 3 | 18 | Ben Arkle | 99 | Cheshire | 1:12.29 |
| 4 | 20 | Lewis Fraser | 00 | Swim Wales W | 1:09.13 |
| 5 | 19 | Alexander Ireland | 00 | Kent | 1:10.60 |
| 6 | 17 | Harry Devlin | 00 | Yorkshire | 1:12.60 |
| 7 | 15 | Benjamin Hutchins | 00 | Berks&SBucks | 1:13.03 |
| 8 | 13 | Nathan Hughes | 00 | Herts | 1:14.15 |
| 9 | 11 | Andrew Flanigan | 00 | Swim Wales E | 1:17.34 |