EVENT 206 Open/Male 09/Over 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Noah REDWOOD-MOORE | 11 | Melton M'bry | 1:10.77 |
| 2 | 4 | Benjamin TETLAW | 14 | Newark | 54.97 |
| 3 | 6 | Dylan MACKIE | 12 | March | 53.23 |
| 4 | 8 | Jamie BEACOM | 12 | March | 52.56 |
| 5 | 7 | Damir IVANOVS | 9 | Boston | 53.15 |
| 6 | 5 | Benjamin SHEARN | 10 | Grantham | 53.82 |
| 7 | 3 | Alex NEVARD | 12 | Grantham | 1:08.42 |
| 8 | 1 | Coen RUCK | 10 | Louth | 1:20.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Jacob URE | 12 | March | 48.47 |
| 2 | 12 | Zachary LAWRENCE | 11 | Louth | 45.52 |
| 3 | 14 | Thomas KINNEAR | 12 | Grantham | 44.40 |
| 4 | 16 | Henry DOLAN | 10 | Grantham | 42.40 |
| 5 | 15 | Sasha ROMANOVSKIJ | 9 | Newark | 43.40 |
| 6 | 13 | Markas PARAPIJONAVICIU | 10 | Grantham | 44.90 |
| 7 | 11 | Freddie HIRST | 9 | Grantham | 47.30 |
| 8 | 9 | Jayden GOWLING | 12 | Skegness | 50.81 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Freddie PRICE | 12 | Louth | 41.41 |
| 2 | 20 | Albert HAILE | 12 | Louth | 40.90 |
| 3 | 22 | Eugene CHEUNG | 12 | Grantham | 40.26 |
| 4 | 24 | Reid HATCH | 11 | Gainsborough | 39.61 |
| 5 | 23 | George LEONARD | 11 | Grantham | 39.94 |
| 6 | 21 | Toby EDMONDSON | 9 | Grantham | 40.39 |
| 7 | 19 | Clayton CHRISTENSEN | 13 | Melton M'bry | 41.40 |
| 8 | 17 | Elliot GLEAVE | 11 | Grantham | 41.72 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Mason RILEY | 13 | March | 38.96 |
| 2 | 28 | Jakob NELSON | 14 | Newark | 36.90 |
| 3 | 30 | Jack HATCH | 14 | Gainsborough | 36.41 |
| 4 | 32 | Harry RICKARD | 13 | March | 34.09 |
| 5 | 31 | Benjamin MORRIS | 14 | Boston | 35.77 |
| 6 | 29 | Thomas HILLSON | 11 | Grantham | 36.60 |
| 7 | 27 | Leo BARNETT | 12 | Grantham | 38.76 |
| 8 | 25 | Joel SADLER | 13 | Grantham | 39.60 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Ben CARLYLE | 14 | Grantham | 33.38 |
| 2 | 37 | Isaac SHAW | 16 | Newark | 30.90 |
| 3 | 39 | Adam FOUND | 27 | Grantham | 29.50 |
| 4 | 41 | Owen HATHWAY | 17 | Grantham | 28.65 |
| 5 | 40 | Ryan NORTON | 16 | Boston | 28.83 |
| 6 | 38 | Zach HOPKINSON | 15 | Grantham | 30.42 |
| 7 | 36 | Leo GARRISON | 17 | Gainsborough | 31.34 |
| 8 | 33 | Ant HALL | 15 | March | 33.59 |