EVENT 117 Boys 16/17 Yrs 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Joseph Sadler | 16 | Notts | 59.00 |
| 1 | 4 | Jay Cushen | 16 | Cheshire | 58.28 |
| 2 | 6 | Iain Rose | 17 | Scot East | 58.10 |
| 3 | 8 | Elliott Day | 17 | Suffolk | 57.91 |
| 4 | 10 | Lewis Binning | 16 | Essex | 57.81 |
| 5 | 9 | Maximillian Bolcato | 17 | Ox & N Bucks | 57.85 |
| 6 | 7 | Aiden McMillan | 16 | Kent | 58.10 |
| 7 | 5 | Lewis Maxwell | 16 | N & Durham | 58.16 |
| 8 | 3 | Theo Savva | 17 | Swim Wales E | 58.92 |
| 9 | 1 | William Brookes | 17 | Derbyshire | 59.47 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Ewan Wilson | 17 | Lancashire | 57.72 |
| 1 | 14 | Mark Ford | 16 | Scot West | 56.89 |
| 2 | 16 | Joshua Gammon | 16 | Devon | 56.79 |
| 3 | 18 | Charlie Hutchison | 17 | Shropshire | 56.08 |
| 4 | 20 | Edward Mildred | 16 | Northants | 53.29 |
| 5 | 19 | Cole Hewitt | 17 | Yorkshire | 53.90 |
| 6 | 17 | Huw Williams | 17 | Somerset | 56.77 |
| 7 | 15 | Eliot Desforges | 16 | Berks&SBucks | 56.80 |
| 8 | 13 | Dillon Chana | 16 | Middlesex | 57.23 |
| 9 | 11 | Luke Shaw | 17 | Surrey | 57.74 |