EVENT 305 Open/Male 09 /Over 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Ralph MILNE | 11 | Grantham | |
| 4 | 2 | Henry BOWERS | 10 | Grantham | |
| 5 | 3 | Oscar BEMBRIDGE | 10 | Grantham | |
| 6 | 4 | Henry LEONARD | 10 | Grantham | 1:43.83 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | George DOLAN | 10 | Grantham | 1:37.79 |
| 2 | 6 | Daniel GODDARD | 11 | Grantham | 1:35.48 |
| 3 | 7 | Benjamin SHEARN | 12 | Grantham | 1:30.23 |
| 4 | 8 | Cyril BAO | 10 | Grantham | 1:28.78 |
| 5 | 9 | Freddie HIRST | 12 | Grantham | 1:27.18 |
| 6 | 10 | William PENNOCK | 12 | Grantham | 1:25.55 |
| 7 | 11 | Benjamin GODDARD | 13 | Grantham | 1:25.37 |
| 8 | 12 | Joshua KIM | 14 | Grantham | 1:25.28 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Louis WRIGHT | 13 | Grantham | 1:24.52 |
| 2 | 14 | Leo BARNETT | 14 | Grantham | 1:24.44 |
| 3 | 15 | Henry DOLAN | 13 | Grantham | 1:23.98 |
| 4 | 16 | Jimmin BAO | 13 | Grantham | 1:23.60 |
| 5 | 17 | Derrin BROCKLEBANK | 12 | Grantham | 1:20.99 |
| 6 | 18 | Toby EDMONDSON | 12 | Grantham | 1:19.38 |
| 7 | 19 | Elliot GLEAVE | 13 | Grantham | 1:15.88 |
| 8 | 20 | Markas PARAPIJONAVICIU | 13 | Grantham | 1:13.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Thomas HILLSON | 13 | Grantham | 1:12.03 |
| 2 | 24 | Francesco MONACO | 14 | Grantham | 1:05.57 |
| 3 | 26 | Benjamin ROBERTS | 17 | Grantham | 1:03.22 |
| 4 | 28 | Ben CARLYLE | 16 | Grantham | 57.75 |
| 5 | 27 | James DOBNEY | 22 | Grantham | 1:02.00 |
| 6 | 25 | Kieran LUCY | 16 | Grantham | 1:05.43 |
| 7 | 23 | Zach HOPKINSON | 17 | Grantham | 1:07.87 |
| 8 | 21 | George LEONARD | 14 | Grantham | 1:12.18 |