EVENT 104 Open/Male 09 /Over 100m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Henry BOWERS | 10 | Grantham | 1:45.45 |
| 3 | 2 | Harry BIBBY | 9 | Grantham | 1:37.06 |
| 4 | 3 | Ralph MILNE | 11 | Grantham | 1:35.37 |
| 5 | 4 | Henry LEONARD | 10 | Grantham | 1:31.39 |
| 6 | 5 | George DOLAN | 10 | Grantham | 1:28.69 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Daniel GODDARD | 11 | Grantham | 1:22.12 |
| 2 | 7 | Cyril BAO | 10 | Grantham | 1:21.85 |
| 3 | 8 | Louis WRIGHT | 13 | Grantham | 1:21.20 |
| 4 | 9 | Benjamin SHEARN | 12 | Grantham | 1:18.11 |
| 5 | 10 | William PENNOCK | 12 | Grantham | 1:16.52 |
| 6 | 11 | Benjamin GODDARD | 13 | Grantham | 1:13.12 |
| 7 | 12 | Henry DOLAN | 13 | Grantham | 1:12.85 |
| 8 | 13 | Freddie HIRST | 12 | Grantham | 1:11.82 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Jimmin BAO | 13 | Grantham | 1:11.36 |
| 2 | 15 | Leo BARNETT | 14 | Grantham | 1:10.53 |
| 3 | 16 | Derrin BROCKLEBANK | 12 | Grantham | 1:09.95 |
| 4 | 17 | Thomas HILLSON | 13 | Grantham | 1:09.14 |
| 5 | 18 | Elliot GLEAVE | 13 | Grantham | 1:08.92 |
| 6 | 19 | Arthur BREARLEY-NEWSOM | 15 | Grantham | 1:07.86 |
| 7 | 20 | Toby EDMONDSON | 12 | Grantham | 1:07.71 |
| 8 | 21 | Joshua KIM | 14 | Grantham | 1:06.97 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Yu Ching (Eugene) CHEU | 15 | Grantham | 1:05.30 |
| 2 | 25 | Francesco MONACO | 14 | Grantham | 1:01.25 |
| 3 | 27 | Kieran LUCY | 16 | Grantham | 57.72 |
| 4 | 29 | James DOBNEY | 22 | Grantham | 55.32 |
| 5 | 28 | Ben CARLYLE | 16 | Grantham | 55.81 |
| 6 | 26 | Zach HOPKINSON | 17 | Grantham | 59.43 |
| 7 | 24 | George LEONARD | 14 | Grantham | 1:04.00 |
| 8 | 22 | Markas PARAPIJONAVICIU | 13 | Grantham | 1:05.49 |