| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Rahul Reedha | 10 | Corby | 3:39.40 |
| 4 | 3 | Noah Patterson | 10 | Wellingboro | 3:22.69 |
| 5 | 2 | Louis Pell | 12 | Northampton | 3:28.45 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Oscar Venn | 11 | Northampton | 3:21.92 |
| 2 | 6 | Reuben Tipping | 12 | Northampton | 3:15.36 |
| 3 | 8 | Jack Tindle | 11 | Northampton | 3:10.42 |
| 4 | 10 | James Oscroft | 10 | Northampton | 3:08.81 |
| 5 | 9 | Jack Webb | 12 | Wellingboro | 3:09.48 |
| 6 | 7 | Owen Hemmings-Kneller | 12 | Wellingboro | 3:12.62 |
| 7 | 5 | Daniel Rees | 12 | Daventry | 3:17.59 |