EVENT 104 Boys 11/14 Yrs 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Jack Tindle | 11 | Northampton | 6:32.70 |
| 4 | 3 | David Smurawa | 13 | Rykneld | 6:12.73 |
| 5 | 2 | Oscar Durant | 12 | Grantham | 6:31.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Noah Dewsnap | 12 | Bassetlaw SS | 6:09.77 |
| 2 | 6 | James Cash | 13 | Deepings | 5:59.40 |
| 3 | 8 | Charlie Bisby | 12 | South Lincs | 5:58.30 |
| 4 | 10 | James Hockey | 14 | Coalville | 5:50.90 |
| 5 | 9 | Oliver Shepherd | 14 | Deepings | 5:53.46 |
| 6 | 7 | Oliver Whittaker | 13 | Nova Cent'n | 5:59.10 |
| 7 | 5 | James Huckle | 12 | Lincoln Vulc | 6:09.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Morgan Farrar | 14 | Co Lincoln P | 5:41.10 |
| 2 | 20 | Emerson-Blu Gupwell | 13 | Co Leicester | 5:31.90 |
| 3 | 26 | Samuel Green | 13 | Bassetlaw SS | 5:25.77 |
| 4 | 32 | Zach Hopkinson | 14 | Grantham | 5:16.90 |
| 5 | 29 | Brodie Butlin | 14 | Nova Cent'n | 5:22.50 |
| 6 | 23 | Maxwell Millington | 14 | Nova Cent'n | 5:29.28 |
| 7 | 17 | Kenny Smith | 14 | Co Leicester | 5:37.00 |
| 8 | 11 | Maxwell Burdett | 11 | Co Leicester | 5:50.40 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Jack Welbourne | 14 | Nova Cent'n | 5:39.12 |
| 2 | 21 | Joel Harby | 14 | Nova Cent'n | 5:31.10 |
| 3 | 27 | Austyn Manley | 13 | Nova Cent'n | 5:25.17 |
| 4 | 33 | Jack Hurry | 14 | Northampton | 5:11.68 |
| 5 | 30 | Oliver Davies | 14 | Co Leicester | 5:22.10 |
| 6 | 24 | Frank Lamb | 14 | South Lincs | 5:29.00 |
| 7 | 18 | Harry Lucas | 13 | Co Leicester | 5:35.20 |
| 8 | 12 | Henry Jones | 14 | Eckington | 5:48.46 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | William Newham | 14 | Calv Bing | 5:38.42 |
| 2 | 22 | Jack Smith | 13 | Co Leicester | 5:30.50 |
| 3 | 28 | Oliver Smith | 14 | Nova Cent'n | 5:24.10 |
| 4 | 34 | Billy Harding | 14 | Repton | 5:11.40 |
| 5 | 31 | Jacob Pemberton | 14 | BelperMarlin | 5:18.30 |
| 6 | 25 | Thomas Townsend | 14 | Repton | 5:27.42 |
| 7 | 19 | Freddie Burdett | 13 | Co Leicester | 5:35.00 |
| 8 | 13 | Edward Oscroft | 14 | Northampton | 5:43.29 |