EVENT 111 Open/Male 09 /Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Htet Myet HTUN | 14 | Grantham | |
| 3 | 2 | Finlay MATHESON | 9 | Co Lincoln P | 1:50.00 |
| 4 | 3 | Leo FRANCZAK | 9 | Co Lincoln P | 1:50.00 |
| 5 | 4 | Hugo BRAILSFORD | 12 | Deepings | 1:36.07 |
| 6 | 5 | Sebastian MADDISON | 14 | Co Lincoln P | 1:31.44 |
| 7 | 6 | Henry DOLAN | 12 | Grantham | 1:21.70 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Yu Ching CHEUNG | 14 | Grantham | 1:14.87 |
| 2 | 10 | Finley WEST | 14 | Co Lincoln P | 1:14.47 |
| 3 | 12 | Oliver GARNER | 16 | Co Lincoln P | 1:04.80 |
| 4 | 14 | Luke DAYBELL | 16 | Grantham | 1:02.86 |
| 5 | 13 | Benjamin DERBY | 17 | Lincoln Vulc | 1:04.61 |
| 6 | 11 | Archie FRENCH | 16 | Lincoln Vulc | 1:08.59 |
| 7 | 9 | Leo BARNETT | 14 | Grantham | 1:14.60 |
| 8 | 7 | Toby EDMONDSON | 11 | Grantham | 1:17.77 |