EVENT 104 Boys 100m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Toby EDMONDSON | 9 | Grantham | |
| 4 | 2 | Benjamin SHEARN | 9 | Grantham | |
| 5 | 3 | Daniel GODDARD | 8 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Austin CHEN-REES | 10 | Grantham | |
| 2 | 5 | William PENNOCK | 9 | Grantham | |
| 3 | 6 | Freddie HIRST | 9 | Grantham | |
| 4 | 7 | Alex NEVARD | 11 | Grantham | |
| 5 | 8 | Woody CLARK | 9 | Grantham | 1:50.58 |
| 6 | 9 | Thomas KINNEAR | 13 | Grantham | 1:49.25 |
| 7 | 10 | Benjamin GODDARD | 10 | Grantham | 1:45.20 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Derrin BROCKLEBANK | 9 | Grantham | 1:42.42 |
| 2 | 12 | Barnaby DURANT | 10 | Grantham | 1:41.89 |
| 3 | 13 | George LEONARD | 11 | Grantham | 1:35.30 |
| 4 | 14 | Henry DOLAN | 10 | Grantham | 1:32.32 |
| 5 | 15 | Yu Ching CHEUNG | 12 | Grantham | 1:31.57 |
| 6 | 16 | Thomas HILLSON | 10 | Grantham | 1:30.80 |
| 7 | 17 | Leo BARNETT | 11 | Grantham | 1:28.96 |
| 8 | 18 | Elliot GLEAVE | 10 | Grantham | 1:28.65 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Oscar CHEN REES | 11 | Grantham | 1:27.56 |
| 2 | 20 | Joshua KIM | 11 | Grantham | 1:23.74 |
| 3 | 21 | Samuel NICHOLS | 11 | Grantham | 1:22.15 |
| 4 | 22 | Alfie HAIGH | 14 | Grantham | 1:22.09 |
| 5 | 23 | Fabian KOLASA | 12 | Grantham | 1:21.92 |
| 6 | 24 | A BREARLEY-NEWSOME | 12 | Grantham | 1:21.74 |
| 7 | 25 | Joel SADLER | 12 | Grantham | 1:18.46 |
| 8 | 26 | Oscar DURANT | 12 | Grantham | 1:15.80 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 28 | James NICHOLS | 14 | Grantham | 1:08.06 |
| 2 | 30 | Jacob FISH | 14 | Grantham | 59.95 |
| 3 | 32 | Owen HATHWAY | 17 | Grantham | 57.50 |
| 4 | 34 | Joshua CLARKE | 15 | Grantham | 57.06 |
| 5 | 33 | James DOBNEY | 19 | Grantham | 57.30 |
| 6 | 31 | Zach HOPKINSON | 14 | Grantham | 59.43 |
| 7 | 29 | Luke DAYBELL | 14 | Grantham | 1:03.10 |
| 8 | 27 | Ben CARLYLE | 13 | Grantham | 1:15.50 |