EVENT 101 Boy Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Vincent NAVARRO | 12 | Co Sheffield | 7:58.00 |
| 2 | 3 | Hudson SMITH | 10 | Co Leeds | 7:15.00 |
| 3 | 5 | Oliver BARRETT | 10 | Co Leeds | 7:00.70 |
| 4 | 7 | James THOMSON | 12 | Co Leeds | 6:51.10 |
| 5 | 6 | Jackson CLARKE | 11 | Co Leeds | 6:57.90 |
| 6 | 4 | Reuben HARRISON | 11 | Co Leeds | 7:13.00 |
| 7 | 2 | Joshua MCMILLAN | 10 | Co Leeds | 7:47.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Gethin SINCLAIR | 12 | Co Sheffield | 6:45.00 |
| 1 | 11 | Halo BENTLEY-HICKS | 10 | Co Leeds | 6:38.10 |
| 2 | 13 | Max DAWSON | 13 | Co Sheffield | 6:35.00 |
| 3 | 15 | Zach CROWTHER | 13 | Co Leeds | 6:29.06 |
| 4 | 17 | Samuel JACKSON | 13 | Spenborough | 6:09.80 |
| 5 | 16 | Jacob BOGGON | 13 | Co Leeds | 6:22.70 |
| 6 | 14 | Oliver KEENS | 12 | Rotherham Mo | 6:30.00 |
| 7 | 12 | Patrick O'HARA | 11 | Co Leeds | 6:36.70 |
| 8 | 10 | Isaac FOY | 13 | Co Leeds | 6:41.20 |
| 9 | 8 | Oscar GAVELLE | 12 | Rotherham Mo | 6:45.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Jared ALMOND | 14 | Bo Barnsley | 5:41.30 |
| 1 | 21 | Callum RAVEN | 13 | Co Leeds | 5:37.50 |
| 2 | 23 | Joseph HALL | 13 | Co Leeds | 5:33.60 |
| 3 | 25 | Ethan ROCHESTER | 15 | Co Sheffield | 5:30.00 |
| 4 | 27 | Harrison NILAND | 16 | Rotherham Mo | 5:10.10 |
| 5 | 26 | James MCLEARY | 17 | Darlington | 5:10.20 |
| 6 | 24 | Daniel RANSOM | 13 | Co Leeds | 5:31.70 |
| 7 | 22 | Maxwell FORD | 13 | Co Leeds | 5:37.47 |
| 8 | 20 | Thomas WOOFFINDIN | 12 | Co Wakefield | 5:39.80 |
| 9 | 18 | Oliver STEELE | 14 | Co Leeds | 5:58.30 |