EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Benjamin Waller | 13 | Cornwall | 1:28.03 |
| 1 | 3 | Sydney Newnham-Stebbin | 13 | Suffolk | 1:24.81 |
| 2 | 5 | Jamie Ingledew | 13 | Scot Midland | 1:22.67 |
| 3 | 7 | Tyler McLean | 12 | Shropshire | 1:21.70 |
| 4 | 9 | Alexander Rogers | 13 | Warwicks | 1:20.20 |
| 5 | 8 | Will Cole | 13 | Gloucs | 1:20.63 |
| 6 | 6 | Thomas Harrington | 13 | Cambs | 1:22.46 |
| 7 | 4 | Nico Winkler | 13 | Northants | 1:22.70 |
| 8 | 2 | Andrew Flanigan | 12 | Swim Wales E | 1:26.91 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Jack Melia | 13 | Leics | 1:19.54 |
| 1 | 13 | Nicholas Savill | 13 | Sussex | 1:19.19 |
| 2 | 15 | George Bennett | 13 | Norfolk | 1:18.27 |
| 3 | 17 | Ashley Markall | 13 | Worcs | 1:16.07 |
| 4 | 19 | Jordan Bull | 13 | Lincolnshire | 1:15.70 |
| 5 | 18 | Conor Keye | 13 | Wiltshire | 1:15.99 |
| 6 | 16 | George Rodger | 13 | Bedfordshire | 1:16.80 |
| 7 | 14 | Lewis Fraser | 12 | Swim Wales W | 1:18.75 |
| 8 | 12 | Connor Joyce | 12 | Cumbria | 1:19.34 |
| 9 | 10 | James Wamsley | 13 | Devon | 1:19.67 |