EVENT 32 Men MC 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Samuel NICHOLS | 10 | Grantham | 2:10.00 |
| 3 | 2 | Robert WASHBROOK | 12 | Lincoln Vulc | 2:01.00 |
| 4 | 3 | Luca HALLAM | 10 | Grantham | 1:59.37 |
| 5 | 4 | Fabian KOLASA | 11 | Grantham | 1:55.57 |
| 6 | 6 | Jonathan GBYLICZEK | 10 | Lincoln Vulc | 1:45.00 |
| 7 | 7 | Oscar DURANT | 11 | Grantham | 1:41.69 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Henry BUCKLEY | 13 | Louth | 1:39.34 |
| 2 | 9 | Jacob HEGG | 12 | Lincoln Vulc | 1:39.18 |
| 3 | 10 | Oliver SHEPHERD | 12 | Deepings | 1:38.13 |
| 4 | 11 | Ashton HUNTER | 9 | Deepings | 1:37.59 |
| 5 | 12 | Layton ANNISON-SNOWDEN | 12 | Louth | 1:37.16 |
| 6 | 13 | Theo BACON | 11 | Grantham | 1:35.00 |
| 7 | 14 | Themba LUNGU | 12 | Lincoln Vulc | 1:32.96 |
| 8 | 15 | Jack BELL | 13 | Deepings | 1:30.32 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Harrison BYWATER | 14 | Loughborough | 1:26.90 |
| 2 | 17 | Bailey CHILVERS | 17 | Deepings | 1:26.08 |
| 3 | 18 | Matthew TOMPKINSON | 12 | Louth | 1:25.65 |
| 4 | 19 | Jack HICKS | 12 | Lincoln Vulc | 1:24.82 |
| 5 | 20 | Benjamin DERBY | 13 | Lincoln Vulc | 1:24.30 |
| 6 | 21 | Jack CRADOCK | 13 | Deepings | 1:24.00 |
| 7 | 22 | Daniel HEPPLESTONE | 11 | Lincoln Vulc | 1:22.65 |
| 8 | 23 | Zach HOPKINSON | 13 | Grantham | 1:21.60 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | William GRAY | 14 | Grantham | 1:19.29 |
| 2 | 27 | Jake ADAMS | 14 | Louth | 1:14.07 |
| 3 | 30 | Leon BAILEY | 16 | Louth | 1:10.10 |
| 4 | 34 | James LAKE | 15 | Loughborough | 1:04.41 |
| 5 | 33 | Owen HATHWAY | 15 | Grantham | 1:04.52 |
| 6 | 28 | Jacob SOWDEN | 15 | Lincoln Vulc | 1:11.75 |
| 7 | 26 | James NICHOLS | 13 | Grantham | 1:14.50 |
| 8 | 24 | Dominik WASHBROOK | 14 | Lincoln Vulc | 1:20.90 |