EVENT 103 Open/Male 09/Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 2 | GEORGE WOODHEAD | 11 | | Gainsborough | 1:49.58 |
| 3 | 4 | Henry DOLAN | 10 | | Grantham | 1:47.80 |
| 4 | 6 | Albert HAILE | 12 | | Louth | 1:46.30 |
| 5 | 5 | Leo BARNETT | 12 | | Grantham | 1:47.53 |
| 6 | 3 | Thomas KINNEAR | 12 | | Grantham | 1:49.50 |
| 7 | 1 | Freddie HIRST | 9 | | Grantham | 1:56.51 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 8 | Markas PARAPIJONAVICIU | 10 | | Grantham | 1:40.00 |
| 2 | 10 | Joel SADLER | 13 | | Grantham | 1:35.35 |
| 3 | 12 | Jakob NELSON | 14 | | Newark | 1:27.05 |
| 4 | 14 | Thomas HILLSON | 11 | | Grantham | 1:20.60 |
| 5 | 13 | Fabian KOLASA | 13 | | Grantham | 1:24.65 |
| 6 | 11 | Toby EDMONDSON | 9 | | Grantham | 1:33.27 |
| 7 | 9 | Eugene CHEUNG | 12 | | Grantham | 1:36.70 |
| 8 | 7 | Clayton CHRISTENSEN | 13 | | Melton M'bry | 1:40.31 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 16 | Joshua GILL | 20 | S14 | Gainsborough | 1:18.44 |
| 2 | 18 | Isaac SHAW | 16 | | Newark | 1:12.53 |
| 3 | 20 | Ryan NORTON | 16 | | Boston | 1:04.61 |
| 4 | 22 | Owen HATHWAY | 17 | | Grantham | 1:01.40 |
| 5 | 21 | Jacob FISH | 14 | | Grantham | 1:03.51 |
| 6 | 19 | Zach HOPKINSON | 15 | | Grantham | 1:05.33 |
| 7 | 17 | James HUCKLE | 12 | | Lincoln Vulc | 1:13.72 |
| 8 | 15 | Benjamin MORRIS | 14 | | Boston | 1:19.90 |