| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Aaron COOK | 16 | Worcester | : . |
| 1 | 2 | Jack BILLINGS | 15 | Bromley | : . |
| 2 | 3 | Jackson OLIN | 16 | Camden Swiss | : . |
| 3 | 4 | Aiden MCMILLAN | 16 | Sevenoaks | : . |
| 4 | 5 | Ben CHOO-YIN | 16 | Co Cardiff | : . |
| 5 | 6 | Kieran DALE | 16 | Thanet Swim | : . |
| 6 | 7 | Billy LEE-KNOWLES | 15 | Ealing | : . |
| 7 | 8 | Edward MILDRED | 15 | Northampton | : . |
| 8 | 9 | Rhys EDWARDS | 16 | Swansea Aq | : . |
| 9 | 10 | Tom SILK | 16 | Co Liverpool | : . |