EVENT 104 Boys 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Jack Duncan | 12 | Scot North | 1:22.01 |
| 1 | 4 | Joseph Wakefield | 13 | Notts | 1:20.10 |
| 2 | 6 | Ole Mills | 13 | Essex | 1:19.02 |
| 3 | 8 | Toby Aldridge | 13 | Middlesex | 1:16.89 |
| 4 | 10 | Greg Reid | 13 | Scot East | 1:16.27 |
| 5 | 9 | Ben Arkle | 12 | Cheshire | 1:16.82 |
| 6 | 7 | William Ward | 13 | Surrey | 1:18.80 |
| 7 | 5 | Liam Reveley | 13 | N & Durham | 1:19.25 |
| 8 | 3 | Edward Jenkinson | 13 | Hampshire | 1:21.68 |
| 9 | 1 | Luke Roxburgh | 13 | Dorset | 1:26.79 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Tom Dean | 12 | Berks&SBucks | 1:15.90 |
| 1 | 14 | Gabriel Butler | 13 | Staffs | 1:14.82 |
| 2 | 16 | Sebastien Stewart | 12 | Kent | 1:14.40 |
| 3 | 18 | David Murphy | 13 | Ox & N Bucks | 1:12.84 |
| 4 | 20 | Benjamin Lawton | 13 | Somerset | 1:12.70 |
| 5 | 19 | Max Ashworth | 13 | Herts | 1:12.80 |
| 6 | 17 | Daniel Johnson | 13 | Derbyshire | 1:13.60 |
| 7 | 15 | Harry Devlin | 12 | Yorkshire | 1:14.80 |
| 8 | 13 | Cameron Muir | 13 | Scot West | 1:15.47 |
| 9 | 11 | William Ritchie | 13 | Lancashire | 1:16.20 |