EVENT 406 Boys 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | James BACON | 10 | Grantham | |
| 4 | 3 | Derrin BROCKLEBANK | 9 | Grantham | |
| 5 | 4 | William PENNOCK | 9 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Austin CHEN-REES | 10 | Grantham | |
| 2 | 6 | Yu Ching CHEUNG | 12 | Grantham | |
| 3 | 7 | Alex NEVARD | 11 | Grantham | |
| 4 | 8 | Benjamin SHEARN | 9 | Grantham | |
| 5 | 9 | Thomas KINNEAR | 13 | Grantham | 2:00.22 |
| 6 | 10 | Woody CLARK | 9 | Grantham | 1:58.91 |
| 7 | 12 | Barnaby DURANT | 10 | Grantham | 1:48.07 |
| 8 | 13 | Henry DOLAN | 10 | Grantham | 1:47.70 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | George LEONARD | 11 | Grantham | 1:47.10 |
| 2 | 15 | Leo BARNETT | 11 | Grantham | 1:45.77 |
| 3 | 16 | Oscar CHEN REES | 11 | Grantham | 1:37.97 |
| 4 | 17 | Elliot GLEAVE | 10 | Grantham | 1:37.44 |
| 5 | 18 | Thomas HILLSON | 10 | Grantham | 1:36.11 |
| 6 | 19 | Samuel NICHOLS | 11 | Grantham | 1:33.81 |
| 7 | 20 | Joel SADLER | 12 | Grantham | 1:23.89 |
| 8 | 21 | Oscar DURANT | 12 | Grantham | 1:23.88 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | James NICHOLS | 14 | Grantham | 1:19.00 |
| 2 | 26 | Zach HOPKINSON | 14 | Grantham | 1:10.92 |
| 3 | 28 | Jack ZERAVICA | 15 | Grantham | 1:04.28 |
| 4 | 30 | Joshua CLARKE | 15 | Grantham | 1:02.34 |
| 5 | 29 | Owen HATHWAY | 17 | Grantham | 1:02.68 |
| 6 | 27 | Jacob FISH | 14 | Grantham | 1:04.65 |
| 7 | 24 | Ben CARLYLE | 13 | Grantham | 1:18.65 |
| 8 | 22 | Theo BACON | 13 | Grantham | 1:22.48 |