EVENT 123 Boys 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 2 | Angus Jarvis | 99 | Cornwall | 1:13.98 |
| 2 | 4 | Samuel Hall | 00 | Worcs | 1:10.38 |
| 3 | 6 | Michael Dorsman | 99 | Wiltshire | 1:09.00 |
| 4 | 8 | Matthew Gray | 00 | Cambs | 1:08.40 |
| 5 | 7 | Joe Murray | 99 | Bedfordshire | 1:08.50 |
| 6 | 5 | Stephen Stanley | 99 | Staffs | 1:09.10 |
| 7 | 3 | Finlay Goodman | 99 | Northants | 1:11.92 |
| 8 | 1 | Michael Doyle | 00 | Shropshire | 1:15.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 10 | George Hopkins | 99 | Sussex | 1:07.20 |
| 2 | 12 | Luke Roxborough | 99 | Dorset | 1:06.60 |
| 3 | 14 | Samuel Peck | 00 | Norfolk | 1:05.80 |
| 4 | 16 | Cameron Muir | 99 | Scot West | 1:03.19 |
| 5 | 15 | Andrew Paige | 99 | Devon | 1:05.60 |
| 6 | 13 | Alexander Rogers | 99 | Warwicks | 1:06.14 |
| 7 | 11 | Connor Joyce | 00 | Cumbria | 1:07.01 |
| 8 | 9 | Hedley Butlin | 99 | Lincolnshire | 1:07.35 |