EVENT 103 Open/Male 09 /Over 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Henry LEONARD | 9 | Grantham | |
| 4 | 2 | Htet Myet HTUN | 14 | Grantham | |
| 5 | 3 | Finlay MATHESON | 9 | Co Lincoln P | 2:18.19 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 4 | Jenson FRANCIS-SWABY | 9 | Co Lincoln P | 2:15.36 |
| 3 | 5 | Louis THOMPSON | 10 | Grantham | 1:54.91 |
| 4 | 6 | Alex HUCKLE | 9 | Co Lincoln P | 1:49.30 |
| 5 | 7 | Leo FRANCZAK | 9 | Co Lincoln P | 1:49.04 |
| 6 | 8 | Theodor BULAT | 12 | Co Lincoln P | 1:45.93 |
| 7 | 9 | Zac RHOADES | 11 | Co Lincoln P | 1:37.82 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Hugo BRAILSFORD | 12 | Deepings | 1:30.90 |
| 2 | 11 | Sebastian MADDISON | 14 | Co Lincoln P | 1:25.14 |
| 3 | 12 | Derrin BROCKLEBANK | 12 | Grantham | 1:20.99 |
| 4 | 13 | Toby EDMONDSON | 11 | Grantham | 1:19.73 |
| 5 | 14 | Thomas HILLSON | 12 | Grantham | 1:16.47 |
| 6 | 15 | Elliot GLEAVE | 13 | Grantham | 1:16.47 |
| 7 | 16 | Sam RHOADES | 14 | Co Lincoln P | 1:15.72 |
| 8 | 17 | Markas PARAPIJONAVICIU | 12 | Grantham | 1:14.51 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Noah SKINNER | 15 | Deepings | 1:11.48 |
| 2 | 21 | Jack HATCH | 15 | Gainsborough | 1:08.92 |
| 3 | 23 | Oliver GARNER | 16 | Co Lincoln P | 1:06.50 |
| 4 | 25 | Benjamin DERBY | 17 | Lincoln Vulc | 1:04.54 |
| 5 | 24 | Jack HICKS | 16 | Lincoln Vulc | 1:06.27 |
| 6 | 22 | Finley WEST | 14 | Co Lincoln P | 1:08.14 |
| 7 | 20 | Jon-Paul HEMMINGS | 46 | Lincoln Vulc | 1:10.17 |
| 8 | 18 | George LEONARD | 13 | Grantham | 1:12.54 |