EVENT 123 Boys 16/17 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Luke Adams | 17 | Lancashire | 1:08.57 |
| 1 | 4 | Henry King | 16 | Suffolk | 1:07.61 |
| 2 | 6 | Daniel Kinsella | 17 | Cheshire | 1:07.44 |
| 3 | 8 | Andrej Drzaic | 17 | Surrey | 1:06.92 |
| 4 | 10 | Joe Bagley | 16 | Derbyshire | 1:06.78 |
| 5 | 9 | Max Hanson | 16 | Middlesex | 1:06.87 |
| 6 | 7 | Pravin Mahendrakumar | 16 | Kent | 1:06.94 |
| 7 | 5 | Lewis Binning | 16 | Essex | 1:07.51 |
| 8 | 3 | Jackson O'Rourke | 17 | Northants | 1:07.62 |
| 9 | 1 | Tom Ward | 17 | N & Durham | 1:08.64 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Thomas White | 17 | Notts | 1:06.54 |
| 1 | 14 | Rory Dickson | 17 | Scot West | 1:05.52 |
| 2 | 16 | Billy Wotton | 16 | Ox & N Bucks | 1:04.52 |
| 3 | 18 | Rhodri Williams | 17 | Swim Wales E | 1:03.92 |
| 4 | 20 | William Ellington | 16 | Somerset | 1:03.83 |
| 5 | 19 | John Kean | 17 | Scot East | 1:03.90 |
| 6 | 17 | Jason Robson | 16 | Yorkshire | 1:04.42 |
| 7 | 15 | Filippo Coacci | 17 | Devon | 1:04.69 |
| 8 | 13 | Nikolai Khutoryanskiy | 16 | Berks&SBucks | 1:06.13 |
| 9 | 11 | Charlie Hutchison | 17 | Shropshire | 1:06.60 |