| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Isacc DONALDSON-BADGER | 11 | Deepings | 47.80 |
| 2 | 2 | Henry DOLAN | 11 | Grantham | 44.44 |
| 3 | 3 | Henry WILLERTON | 11 | Boston | 40.08 |
| 4 | 4 | Thomas HILLSON | 11 | Grantham | 38.25 |
| 5 | 5 | Dan PALMER | 11 | Co Lincoln P | 40.00 |
| 6 | 6 | Toby EDMONDSON | 10 | Grantham | 41.03 |
| 7 | 7 | Barnaby DURANT | 11 | Grantham | 44.49 |
| 8 | 8 | M PARAPIJONAVICIUS | 11 | Grantham | 47.95 |