| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Jack Duff | 12 | Southport | : . |
| 1 | 2 | Lucas Bohm | 12 | Camden Swiss | : . |
| 2 | 3 | Demi Alli | 12 | Sevenoaks | : . |
| 3 | 4 | Lucas Bryl | 12 | Bromley | : . |
| 4 | 5 | Max Stafford-davies | 11 | Mt Kelly | : . |
| 5 | 6 | Patch Robinson | 12 | teamipswich | : . |
| 6 | 7 | Ben Guthrie | 12 | Co Milton K | : . |
| 7 | 8 | Gregor Hutchison | 12 | Thanet Swim | : . |
| 8 | 9 | Edward Ormsby | 12 | Co Cambridge | : . |
| 9 | 10 | William Thomas | 12 | Worcester | : . |