EVENT 404 Men Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 3 | Freddy Clampett | 98 | Plymouth Lea | 55.95 |
| 2 | 7 | Robert Newell | 90 | Loughboro Un | 55.47 |
| 3 | 11 | Archie Goodburn | 01 | Loughboro NC | 54.76 |
| 4 | 15 | Jacob Peters | 00 | Bath NC | 52.19 |
| 5 | 13 | Scott McLay | 99 | UniOfStirl | 52.99 |
| 6 | 9 | Cole Hewitt | 02 | Swansea Uni | 55.25 |
| 7 | 5 | Gregor Swinney | 97 | Co Glasgow | 55.74 |
| 8 | 1 | Mark Ford | 03 | Co Glasgow | 56.89 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 4 | Ross Leslie | 98 | Edinburgh Un | 55.79 |
| 2 | 8 | Jakob Goodman | 00 | Loughboro Un | 55.26 |
| 3 | 12 | Lewis Fraser | 00 | Swansea Uni | 53.03 |
| 4 | 16 | James Guy | 95 | Bath NC | 51.62 |
| 5 | 14 | Edward Mildred | 03 | Northampton | 52.91 |
| 6 | 10 | Thomas Beeley | 99 | Plymouth Lea | 54.82 |
| 7 | 6 | Michael Klimaszewski | 04 | Hatfield | 55.47 |
| 8 | 2 | Isaac Von Fintel | 01 | Repton Swim | 56.85 |