EVENT 111 Open/Male 09 /Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Alfie HAIGH | 14 | Grantham | 1:45.00 |
| 4 | 4 | George LEONARD | 11 | Grantham | 1:42.11 |
| 5 | 3 | Freddie HIRST | 9 | Grantham | 1:44.00 |
| 6 | 1 | Emilijus BINKIS | 12 | South Lincs | 1:52.22 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Eugene CHEU | 12 | Grantham | 1:36.70 |
| 2 | 8 | Toby EDMONDSON | 9 | Grantham | 1:30.00 |
| 3 | 10 | Samuel NICHOLS | 12 | Grantham | 1:25.07 |
| 4 | 12 | Thomas HILLSON | 10 | Grantham | 1:22.10 |
| 5 | 11 | Stanley THURLOW | 11 | Lincoln Vulc | 1:23.12 |
| 6 | 9 | Morgan GRIFFIN | 13 | South Lincs | 1:29.80 |
| 7 | 7 | Elliot MCWHIRTER | 14 | Lincoln TSA | 1:36.00 |
| 8 | 5 | Joshua KIM | 11 | Grantham | 1:39.61 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Freddie TRAGNI | 14 | Co Lincoln P | 1:15.82 |
| 2 | 16 | Connor BOYFIELD | 25 | South Lincs | 1:13.48 |
| 3 | 18 | Kieran LUCY | 13 | South Lincs | 1:10.95 |
| 4 | 20 | Stuart HAMER | 49 | Co Lincoln P | 1:01.63 |
| 5 | 19 | Jacob BRIERS | 15 | Deepings | 1:05.25 |
| 6 | 17 | Oliver SHEPHERD | 14 | Deepings | 1:11.53 |
| 7 | 15 | Jack CRADOCK | 15 | Deepings | 1:15.20 |
| 8 | 13 | John BOOR | 18 | South Lincs | 1:20.56 |