EVENT 117 Boys 16/17 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Ewan Wilson | 16 | Lancashire | 59.60 |
| 1 | 4 | Andre Strydom | 16 | Kent | 59.45 |
| 2 | 6 | Ross Philp | 16 | Middlesex | 58.98 |
| 3 | 8 | Alfie Evans | 17 | Berks&SBucks | 57.94 |
| 4 | 10 | Craig Greenock | 17 | Scot West | 57.63 |
| 5 | 9 | Charlie Poole | 17 | Leics | 57.63 |
| 6 | 7 | Jack Bowyer | 16 | Suffolk | 58.20 |
| 7 | 5 | Samuel Perks | 16 | Essex | 59.38 |
| 8 | 3 | Arnold Marton | 17 | Ox & N Bucks | 59.49 |
| 9 | 1 | Louis Mitchell | 17 | Northants | 59.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Matthew Titman | 16 | Cambs | 57.00 |
| 1 | 14 | Rhys Edwards | 16 | Swim Wales W | 56.61 |
| 2 | 16 | Christian Tai | 17 | Dorset | 56.54 |
| 3 | 18 | Sam Dailley | 17 | Devon | 54.57 |
| 4 | 20 | Santos Villalon | 17 | Somerset | 54.47 |
| 5 | 19 | Archie Goodburn | 17 | Scot East | 54.48 |
| 6 | 17 | Benjamin Chooyin | 16 | Swim Wales E | 56.35 |
| 7 | 15 | Jonathan Milner | 17 | Yorkshire | 56.59 |
| 8 | 13 | Will Morris | 16 | N & Durham | 56.87 |
| 9 | 11 | Ben Rowett | 17 | Surrey | 57.53 |