EVENT 117 Boys 16/17 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Finn Branney | 16 | Cornwall | 1:04.62 |
| 1 | 3 | Michael Hire | 16 | Swim Wales W | 1:02.52 |
| 2 | 5 | Austin Wilson | 17 | Cumbria | 1:01.74 |
| 3 | 7 | Sonny Trigg | 16 | Suffolk | 1:00.96 |
| 4 | 9 | Luke Morris | 17 | Worcs | 1:00.16 |
| 5 | 8 | Liam Doonan | 16 | Cambs | 1:00.52 |
| 6 | 6 | Connor Delaney | 17 | Bedfordshire | 1:01.46 |
| 7 | 4 | Ewan Simpson | 17 | Scot Midland | 1:01.74 |
| 8 | 2 | Thomas Howitt | 17 | Wiltshire | 1:04.03 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Alexander Shreeve | 17 | Norfolk | 59.40 |
| 1 | 13 | Earl Radtschenko | 16 | Warwicks | 59.05 |
| 2 | 15 | George Fearnley | 16 | Devon | 58.93 |
| 3 | 17 | Matt Bray | 16 | Gloucs | 58.33 |
| 4 | 19 | William Condron | 17 | Sussex | 56.80 |
| 5 | 18 | Calum Hughes | 16 | Swim Wales E | 58.16 |
| 6 | 16 | Andrew Ward | 17 | Northants | 58.68 |
| 7 | 14 | Daniel Jones | 16 | Shropshire | 59.01 |
| 8 | 12 | Oliver Bitowt | 17 | Lincolnshire | 59.30 |
| 9 | 10 | Matthew Hincks | 17 | Leics | 59.48 |