EVENT 406 Open/Male 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Harry BEASTALL | 12 | City of Linc Pentaqua SC | 1:01.95 |
| 3 | 3 | Bertie ROSE | 10 | Lincoln Vulcans SC | 52.19 |
| 4 | 2 | Benjamin BUTTERWORTH | 12 | Lincoln Vulcans SC | 58.49 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Emilijus BINKIS | 12 | South Lincs Competitive SC | 47.97 |
| 2 | 7 | Maddox GLASSBY | 11 | Lincoln Vulcans SC | 46.10 |
| 3 | 9 | Jonathan GBYLICZEK | 11 | City of Linc Pentaqua SC | 41.75 |
| 4 | 8 | Noah SKINNER | 13 | Deepings SC | 45.56 |
| 5 | 6 | Callum LOYNES | 11 | City of Linc Pentaqua SC | 47.74 |
| 6 | 4 | Thomas VERE | 9 | South Lincs Competitive SC | 51.67 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Ryan ANDERSON | 12 | Gainsborough Dolphins SC | 39.12 |
| 2 | 13 | Isaac GREENSLADE | 14 | Lincoln Vulcans SC | 37.56 |
| 3 | 15 | Stanley THURLOW | 11 | Lincoln Vulcans SC | 37.06 |
| 4 | 14 | Oliver WILKINSON | 11 | Lincoln Vulcans SC | 37.50 |
| 5 | 12 | Anas LACHHEB | 14 | South Lincs Competitive SC | 38.17 |
| 6 | 10 | Michael SCOTT | 14 | South Lincs Competitive SC | 40.82 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Samuel POTTER | 14 | Bassetlaw Swim Squad | 33.20 |
| 2 | 19 | Sebastian WILKINSON | 18 | Bircotes SC | 30.47 |
| 3 | 21 | Bradley HOLLAND | 15 | South Lincs Competitive SC | 29.37 |
| 4 | 20 | Morgan FARRAR | 14 | City of Linc Pentaqua SC | 29.74 |
| 5 | 18 | Noah DEWSNAP | 12 | Bassetlaw Swim Squad | 32.20 |
| 6 | 16 | Thomas COLLINS | 13 | Bassetlaw Swim Squad | 34.00 |