EVENT 123 Boys 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Liam Doonan | 16 | Cambs | 1:13.30 |
| 1 | 3 | Jordan Batson | 16 | Bedfordshire | 1:11.97 |
| 2 | 5 | Joseph Sadio | 17 | Warwicks | 1:10.82 |
| 3 | 7 | Robert Evans | 17 | Shropshire | 1:10.00 |
| 4 | 9 | Jed Snell | 17 | Norfolk | 1:09.45 |
| 5 | 8 | Ryan Clay | 16 | Suffolk | 1:09.68 |
| 6 | 6 | James Clark | 17 | Wiltshire | 1:10.51 |
| 7 | 4 | Matt Paul | 16 | Northants | 1:11.01 |
| 8 | 2 | Oliver Long | 16 | Cornwall | 1:12.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Connor Oates | 17 | Worcs | 1:08.96 |
| 1 | 13 | Matthew Hincks | 17 | Leics | 1:08.73 |
| 2 | 15 | Jacob Salisbury | 17 | Gloucs | 1:08.22 |
| 3 | 17 | Matthew Gibson | 17 | Sussex | 1:06.88 |
| 4 | 19 | Jack Barker | 17 | Cumbria | 1:05.27 |
| 5 | 18 | Laker Wong | 16 | Devon | 1:06.80 |
| 6 | 16 | Roy Sterling | 17 | Swim Wales W | 1:07.77 |
| 7 | 14 | George Boast | 17 | Swim Wales E | 1:08.36 |
| 8 | 12 | David Trickett | 17 | Lincolnshire | 1:08.90 |
| 9 | 10 | Paul Adamson | 17 | Scot Midland | 1:09.20 |