EVENT 105 Open/Male 09 Yrs/Over 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Gilbert NICHOLLS | 9 | Grantham | |
| 3 | 2 | Oliver MIDDLEBROOK | 9 | Retford | 1:16.32 |
| 4 | 3 | Leo FRANCZAK | 9 | Co Lincoln P | 58.36 |
| 5 | 4 | Finlay MATHESON | 9 | Co Lincoln P | 54.49 |
| 6 | 5 | Zhengxi (John) GUO | 9 | Grantham | 45.61 |
| 7 | 6 | George DOLAN | 9 | Grantham | 43.99 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Damir IVANOVS | 10 | Boston | 41.35 |
| 2 | 8 | Thomas SIMPSON | 14 | Co Lincoln P | 39.93 |
| 3 | 9 | Hugo BRAILSFORD | 12 | Deepings | 39.10 |
| 4 | 10 | Sebastian MADDISON | 14 | Co Lincoln P | 37.49 |
| 5 | 11 | Toby EDMONDSON | 11 | Grantham | 33.67 |
| 6 | 12 | Leo BARNETT | 14 | Grantham | 33.56 |
| 7 | 13 | Yu Ching CHEUNG | 14 | Grantham | 33.37 |
| 8 | 14 | Reid HATCH | 13 | Gainsborough | 32.58 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Jack CRADOCK | 17 | Deepings | 31.61 |
| 2 | 18 | Freddie TRAGNI | 16 | Co Lincoln P | 29.59 |
| 3 | 20 | Benjamin DERBY | 17 | Lincoln Vulc | 28.46 |
| 4 | 22 | Luke DAYBELL | 16 | Grantham | 27.84 |
| 5 | 21 | Ryan NORTON | 18 | Boston | 28.00 |
| 6 | 19 | Oliver GARNER | 16 | Co Lincoln P | 28.78 |
| 7 | 17 | Archie FRENCH | 16 | Lincoln Vulc | 30.25 |
| 8 | 15 | Harry BEASTALL | 14 | Co Lincoln P | 32.53 |