EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Eduardo Camacho | 13 | Cambs | 1:20.94 |
| 1 | 4 | Hans Schmidt | 13 | Swim Wales W | 1:18.84 |
| 2 | 6 | Samuel Smith | 13 | Northants | 1:17.24 |
| 3 | 8 | Dan Hicks | 13 | Surrey | 1:16.66 |
| 4 | 10 | Callum Woolfenden | 13 | Kent | 1:16.64 |
| 5 | 9 | Jamie O'Connor | 13 | Devon | 1:16.65 |
| 6 | 7 | Ryan Sandilands | 13 | Scot West | 1:16.97 |
| 7 | 5 | Oliver Wright | 13 | Middlesex | 1:18.69 |
| 8 | 3 | Lawrence Elliott | 13 | Dorset | 1:20.00 |
| 9 | 1 | Samuel Munroe | 13 | Leics | 1:22.76 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Lewis Crosby | 13 | Lancashire | 1:16.17 |
| 1 | 14 | Can Tugcetin | 13 | Berks&SBucks | 1:15.79 |
| 2 | 16 | Edward Merhan | 13 | Suffolk | 1:14.69 |
| 3 | 18 | Christian Ryan | 13 | N & Durham | 1:13.95 |
| 4 | 20 | Alfie Francis | 13 | Essex | 1:13.83 |
| 5 | 19 | Cameron Green | 13 | Yorkshire | 1:13.89 |
| 6 | 17 | Sunni Johnson | 13 | Ox & N Bucks | 1:14.24 |
| 7 | 15 | Stefan Krawiec | 12 | Scot East | 1:15.41 |
| 8 | 13 | Tristyn James | 12 | Swim Wales E | 1:16.09 |
| 9 | 11 | Richard Towers | 13 | Somerset | 1:16.44 |