EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 1 | Lucas Pearcey | 06 | Wiltshire | 1:22.88 |
| 2 | 3 | Leon Taylor | 06 | Sussex | 1:19.84 |
| 3 | 5 | James Henniker | 06 | Gloucs | 1:19.41 |
| 4 | 7 | James Escolme | 06 | Cumbria | 1:18.24 |
| 5 | 6 | Benjamin Hatfield | 06 | Hampshire | 1:18.68 |
| 6 | 4 | Reece Simpson | 06 | Cambs | 1:19.67 |
| 7 | 2 | Oliver McCulloch | 06 | Bedfordshire | 1:22.77 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 9 | Louis James | 06 | Norfolk | 1:17.51 |
| 1 | 11 | Daniel Holliss | 06 | SE Herts | 1:16.87 |
| 2 | 13 | Ezra Lambert | 06 | Staffs | 1:16.61 |
| 3 | 15 | Tristan Bowen | 06 | Cornwall | 1:15.34 |
| 4 | 17 | Callum Melville | 06 | Lincolnshire | 1:10.33 |
| 5 | 16 | Conor Cherrington | 06 | Dorset | 1:12.46 |
| 6 | 14 | Oliver Kang | 06 | Leics | 1:15.51 |
| 7 | 12 | Joseph-George Troth | 06 | Worcs | 1:16.72 |
| 8 | 10 | James Abulencia | 06 | Warwicks | 1:17.13 |
| 9 | 8 | Ellis Longworth | 06 | Swim Wales W | 1:18.04 |