EVENT 403 Boy 07 Yrs/Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | LEWIS TARVER | 13 | Deepings | |
| 3 | 2 | OLIVER SHEPHERD | 12 | Deepings | |
| 4 | 3 | GEORGE SHAW | 24 | Deepings | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | WILLIAM BURDOCK | 12 | Deepings | |
| 2 | 5 | JOE BLACK | 11 | Deepings | |
| 3 | 6 | LUKE DAYBELL | 12 | Grantham | 6:42.00 |
| 4 | 7 | JACK REYNOLDS | 11 | Grantham | 6:41.97 |
| 5 | 8 | ZACH HOPKINSON | 12 | Grantham | 5:55.32 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | WILLIAM GRAY | 13 | Grantham | 5:48.30 |
| 2 | 10 | JACOB FISH | 12 | Grantham | 5:40.09 |
| 3 | 11 | JAMES NICHOLS | 12 | Grantham | 5:35.03 |
| 4 | 12 | JACOB BRIERS | 13 | Deepings | 5:32.14 |
| 5 | 13 | RIDAS RABASAUSKAS | 13 | Grantham | 5:18.72 |
| 6 | 14 | ELIJAH HALLIDAY | 14 | Grantham | 5:04.97 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | CADE DEAVES | 16 | Grantham | 4:51.58 |
| 2 | 18 | SAMUEL LEVERIDGE | 15 | Grantham | 4:40.01 |
| 3 | 20 | JAMES DOBNEY | 17 | Grantham | 4:19.17 |
| 4 | 19 | GEORGE BERWICK | 18 | Grantham | 4:28.82 |
| 5 | 17 | OWEN HATHWAY | 15 | Grantham | 4:44.69 |
| 6 | 15 | JOSHUA CLARKE | 13 | Grantham | 5:03.61 |