EVENT 117 Boys 16/17 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Connor Keeler | 17 | Cornwall | 1:03.41 |
| 2 | 3 | Luke Bryan | 17 | Norfolk | 1:01.63 |
| 3 | 5 | Kendall Wilkins | 17 | Lincolnshire | 1:01.20 |
| 4 | 7 | Tom Robinson | 17 | Cumbria | 59.43 |
| 5 | 6 | Sam Neeld | 17 | Shropshire | 59.77 |
| 6 | 4 | Sidney Fenwick | 17 | Wiltshire | 1:01.30 |
| 7 | 2 | James McFarland | 16 | Bedfordshire | 1:02.40 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | William Foster | 17 | Derbyshire | 58.39 |
| 1 | 11 | Kye Adams | 17 | Gloucs | 57.97 |
| 2 | 13 | George Mann | 17 | Berks&SBucks | 57.36 |
| 3 | 15 | Matthew Titman | 16 | Cambs | 56.20 |
| 4 | 17 | Danny Savage | 17 | Northants | 52.70 |
| 5 | 16 | Lewis Fraser | 17 | Swim Wales W | 53.87 |
| 6 | 14 | Samuel Osborne | 16 | Worcs | 57.10 |
| 7 | 12 | Lucas Dyson-Diaz | 17 | Herts | 57.54 |
| 8 | 10 | Kane Murcott | 17 | Staffs | 58.33 |
| 9 | 8 | Leo Karski | 16 | Warwicks | 58.40 |