EVENT 408 Open/Male 09 /Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | George DOLAN | 10 | Grantham | |
| 2 | 2 | Louis WRIGHT | 13 | Grantham | |
| 3 | 3 | Cyril BAO | 10 | Grantham | 1:48.50 |
| 4 | 4 | William PENNOCK | 12 | Grantham | 1:38.16 |
| 5 | 5 | Elliot GLEAVE | 13 | Grantham | 1:33.10 |
| 6 | 6 | Benjamin SHEARN | 12 | Grantham | 1:31.65 |
| 7 | 7 | Thomas KINNEAR | 15 | Grantham | 1:24.12 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Freddie HIRST | 12 | Grantham | 1:21.85 |
| 2 | 9 | Henry DOLAN | 13 | Grantham | 1:19.12 |
| 3 | 10 | Joshua KIM | 14 | Grantham | 1:17.25 |
| 4 | 11 | Jimmin BAO | 13 | Grantham | 1:16.59 |
| 5 | 12 | Toby EDMONDSON | 12 | Grantham | 1:15.55 |
| 6 | 13 | Yu Ching (Eugene) CHEU | 15 | Grantham | 1:14.87 |
| 7 | 14 | Markas PARAPIJONAVICIU | 13 | Grantham | 1:13.89 |
| 8 | 15 | George LEONARD | 14 | Grantham | 1:12.12 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Thomas HILLSON | 13 | Grantham | 1:09.51 |
| 2 | 19 | Kieran LUCY | 16 | Grantham | 1:05.36 |
| 3 | 21 | Zach HOPKINSON | 17 | Grantham | 1:01.40 |
| 4 | 23 | James DOBNEY | 22 | Grantham | 57.61 |
| 5 | 22 | Ben CARLYLE | 16 | Grantham | 59.42 |
| 6 | 20 | Luke DAYBELL | 17 | Grantham | 1:02.52 |
| 7 | 18 | Francesco MONACO | 14 | Grantham | 1:07.09 |
| 8 | 16 | Leo BARNETT | 14 | Grantham | 1:11.07 |