| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Samuel HALL | 18 | Worcester | : . |
| 1 | 2 | Matthew ROGERS | 18 | Bromley | : . |
| 2 | 3 | Charlie FRASER-ALLEN | 18 | Camden Swiss | : . |
| 3 | 4 | Christopher LEE | 17 | Sevenoaks | : . |
| 4 | 5 | Fraser DURSTON | 20 | Co Cardiff | : . |
| 5 | 6 | Alexander BOYD | 17 | Thanet Swim | : . |
| 6 | 7 | John BRITTON | 23 | Ealing | : . |
| 7 | 8 | Archie PLOWMAN | 17 | Northampton | : . |
| 8 | 9 | Daniel JERVIS | 22 | Swansea Aq | : . |
| 9 | 10 | Jack GRAHAM | 21 | Co Liverpool | : . |