EVENT 103 Open/Male 09 /Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Joshua FORSYTH | 11 | Lincoln Vulc | 2:00.00 |
| 2 | 2 | Spencer CROSS | 10 | Melton M'bry | 1:48.19 |
| 3 | 3 | Gregory CROSS | 11 | Melton M'bry | 1:47.11 |
| 4 | 4 | Noah REDWOOD-MOORE | 12 | Melton M'bry | 1:40.70 |
| 5 | 5 | Callum LOYNES | 13 | Co Lincoln P | 1:37.66 |
| 6 | 6 | Derrin BROCKLEBANK | 11 | Grantham | 1:36.30 |
| 7 | 7 | Freddie HIRST | 10 | Grantham | 1:33.90 |
| 8 | 8 | Henry DOLAN | 11 | Grantham | 1:31.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Thomas KINNEAR | 13 | Grantham | 1:28.85 |
| 2 | 10 | George LEONARD | 12 | Grantham | 1:25.75 |
| 3 | 11 | Markas PARAPIJONAVICIU | 11 | Grantham | 1:24.69 |
| 4 | 12 | Leo BARNETT | 13 | Grantham | 1:20.44 |
| 5 | 13 | Toby EDMONDSON | 10 | Grantham | 1:20.30 |
| 6 | 14 | Yu Ching (Eugene) CHEU | 13 | Grantham | 1:18.65 |
| 7 | 15 | Harry RICKARD | 14 | March | 1:16.29 |
| 8 | 16 | Ethan HUNTER | 14 | Lincoln Vulc | 1:14.30 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Jacob URE | 13 | March | 1:11.20 |
| 2 | 20 | Oliver JONES | 16 | Lincoln Vulc | 1:08.39 |
| 3 | 22 | Benjamin DERBY | 16 | Lincoln Vulc | 1:05.20 |
| 4 | 24 | Ben CARLYLE | 15 | Grantham | 1:04.00 |
| 5 | 23 | Daniel DEGNAN | 16 | Grantham | 1:04.21 |
| 6 | 21 | Chris WILLERTON | 40 | Skegness | 1:05.58 |
| 7 | 19 | Harry VICKERS | 17 | Lincoln Vulc | 1:08.73 |
| 8 | 17 | Thomas HILLSON | 12 | Grantham | 1:12.50 |