EVENT 203 Boys 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Joshua KIM | 11 | Grantham | |
| 3 | 2 | Thomas KINNEAR | 13 | Grantham | |
| 4 | 3 | Yu Ching CHEUNG | 12 | Grantham | |
| 5 | 4 | Oscar CHEN REES | 11 | Grantham | |
| 6 | 5 | Austin CHEN-REES | 10 | Grantham | |
| 7 | 6 | Barnaby DURANT | 10 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Woody CLARK | 9 | Grantham | |
| 2 | 9 | George LEONARD | 11 | Grantham | 1:48.18 |
| 3 | 10 | Leo BARNETT | 11 | Grantham | 1:47.53 |
| 4 | 11 | Joel SADLER | 12 | Grantham | 1:35.35 |
| 5 | 12 | Thomas HILLSON | 10 | Grantham | 1:34.90 |
| 6 | 13 | Samuel NICHOLS | 11 | Grantham | 1:31.64 |
| 7 | 14 | Ben CARLYLE | 13 | Grantham | 1:27.43 |
| 8 | 15 | Fabian KOLASA | 12 | Grantham | 1:26.92 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Zach HOPKINSON | 14 | Grantham | 1:08.85 |
| 2 | 19 | Daniel DEGNAN | 15 | Grantham | 1:06.24 |
| 3 | 21 | Joshua CLARKE | 15 | Grantham | 1:02.60 |
| 4 | 23 | James DOBNEY | 19 | Grantham | 1:00.60 |
| 5 | 22 | Owen HATHWAY | 17 | Grantham | 1:01.40 |
| 6 | 20 | James NICHOLS | 14 | Grantham | 1:05.31 |
| 7 | 18 | Jacob FISH | 14 | Grantham | 1:06.47 |
| 8 | 16 | Oscar DURANT | 12 | Grantham | 1:23.53 |