EVENT 123 Boys 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Samuel Bryan | 16 | Essex | 1:09.43 |
| 1 | 4 | Daniel New | 17 | Cheshire | 1:08.71 |
| 2 | 6 | Kelvin Wong | 17 | Dorset | 1:07.90 |
| 3 | 8 | Daniel Flint | 16 | Sussex | 1:07.50 |
| 4 | 10 | SAM NICKSON | 17 | Surrey | 1:05.80 |
| 5 | 9 | Sean Armstrong | 17 | N & Durham | 1:07.39 |
| 6 | 7 | Rhys Taylor | 17 | Notts | 1:07.90 |
| 7 | 5 | JAMIE KETTLE | 17 | Leics | 1:08.24 |
| 8 | 3 | Samuel Cottee | 17 | Suffolk | 1:09.05 |
| 9 | 1 | Charlie Hallett | 16 | Hampshire | 1:10.46 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Andrew MacIntosh | 16 | Scot West | 1:04.70 |
| 1 | 14 | James King | 17 | Somerset | 1:04.60 |
| 2 | 16 | Matthew Rogers | 17 | Kent | 1:04.10 |
| 3 | 18 | OLIVER TAVERNER | 16 | Devon | 1:03.60 |
| 4 | 20 | Harry Devlin | 17 | Yorkshire | 1:01.40 |
| 5 | 19 | Callum Smart | 17 | Ox & N Bucks | 1:02.47 |
| 6 | 17 | Jack O'Brien | 17 | Lancashire | 1:03.60 |
| 7 | 15 | Bradley Newman | 16 | Swim Wales E | 1:04.42 |
| 8 | 13 | Miles Clark | 17 | Middlesex | 1:04.70 |
| 9 | 11 | Archie Goodburn | 16 | Scot East | 1:04.70 |