EVENT 301 Open/Male 12 /Over 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 1 | Sebastian Briggs | 14 | | Swadlincote | 12:19.52 |
| 4 | 3 | Fraser Pyefinch | 12 | | Long Eaton | 11:16.62 |
| 5 | 2 | Ryan Bullock | 15 | | Long Eaton | 11:09.06 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 5 | Dominic Whiten | 16 | | Swadlincote | 12:52.05 |
| 1 | 7 | Joshua Day | 16 | | Eckington | DN:C . |
| 2 | 9 | Arlo Hems Gillson | 13 | | Repton | 10:59.73 |
| 3 | 11 | Tyler Shaw | 13 | | Derby Excel | 10:44.37 |
| 4 | 13 | Gabriel Thursfield | 13 | | Repton | 10:36.10 |
| 5 | 12 | Oliver Smith | 12 | | Repton | 10:44.85 |
| 6 | 10 | Ted Pyefinch | 15 | | Long Eaton | 11:21.83 |
| 7 | 8 | Elliott Ratcliffe | 14 | | Etwall | 10:41.26 |
| 8 | 6 | Samuel Cooper | 15 | | Long Eaton | 11:16.80 |
| 9 | 4 | Thomas Pope | 13 | | Long Eaton | 12:03.03 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 15 | Toby Drayson | 13 | | BelperMarlin | 10:25.46 |
| 1 | 17 | Joseph Cooper | 18 | | Long Eaton | 10:29.29 |
| 2 | 19 | Carlos Sierra Villegas | 16 | | Chesterfield | 9:49.90 |
| 3 | 21 | Jack Harris | 15 | | Derby Excel | 9:38.19 |
| 4 | 23 | Alexander Harrand | 19 | | Long Eaton | 8:55.84 |
| 5 | 22 | Dylan Jamieson | 16 | | Derby Excel | 9:17.97 |
| 6 | 20 | Finlay Bird | 14 | | Long Eaton | 9:52.61 |
| 7 | 18 | Lucas Kimber | 15 | | Derby Excel | 9:54.22 |
| 8 | 16 | Kai Gelsthorpe | 18 | S10 | Chesterfield | DN:C . |
| 9 | 14 | Isaac Ebanks | 14 | | Derby Excel | 10:05.85 |