EVENT 401 Boys 12 Yrs/Over 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Owen CARMODY | 13 | Co Leeds | 10:04.97 |
| 2 | 3 | Daniel ROCHE | 14 | Leamington | 10:28.98 |
| 3 | 5 | William KERSHAW | 13 | Blackpool Aq | 10:17.15 |
| 4 | 7 | Koby ORD | 15 | Rotherham Mo | 10:12.51 |
| 5 | 6 | Sebastian GAMINDE | 15 | Harrogate | 9:50.08 |
| 6 | 4 | Hayden LAM | 13 | Co Leeds | 9:48.31 |
| 7 | 2 | Zachary FIDAN | 13 | Teddington | DN:C. |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Luke DYER | 16 | Co Leeds | 9:35.55 |
| 1 | 11 | Archie WIGHTMAN | 13 | Warrington W | 10:04.85 |
| 2 | 13 | Matteo MONACO | 14 | South Lincs | 9:56.06 |
| 3 | 15 | Oscar GAVELLE | 14 | Rotherham Mo | 9:43.50 |
| 4 | 18 | Charlie HINSON | 15 | Co Leeds | 9:19.29 |
| 5 | 17 | Matthew JAMES | 15 | Co Leeds | 9:19.63 |
| 6 | 14 | Euan FLANNERY | 14 | Warrington W | 9:55.40 |
| 7 | 12 | William TAYLOR | 15 | Louth | 10:05.10 |
| 8 | 10 | Connor MCCULLEN | 13 | Co Leeds | 10:02.59 |
| 9 | 8 | Henry KING | 17 | Bo Kirklees | 9:44.67 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 20 | Matthew SAWERS | 14 | Wigan BEST | 9:26.74 |
| 1 | 22 | Jai DIDDEE | 15 | Tynemouth | 9:14.57 |
| 2 | 24 | Andrew CLAVIS | 16 | LiverpoolPen | 9:21.65 |
| 3 | 26 | Simon HARRISON | 15 | Satellite | 9:52.73 |
| 4 | 28 | Jack FINNIE | 16 | Rotherham Mo | 9:03.29 |
| 5 | 27 | Alastair JEFFREY | 18 | Satellite | 9:09.82 |
| 6 | 25 | Joseph HALL | 15 | Co Leeds | 9:14.21 |
| 7 | 23 | Joshua DRURY-TEW | 14 | Co Birm'ham | 9:37.42 |
| 8 | 21 | Jad IDRIS | 17 | Co Leeds | 9:10.85 |
| 9 | 19 | Alfie CHARLTON | 15 | Harrogate | 9:18.65 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 30 | Max HARVEY | 16 | Co Liverpool | DN:C. |
| 1 | 32 | Samuel GRIMES | 17 | Wigan BEST | 8:58.01 |
| 2 | 34 | Benjamin ROSS | 15 | Co Salford | 9:04.38 |
| 3 | 36 | Ethan KELLY | 15 | Co Liverpool | 8:46.73 |
| 4 | 38 | Nathan LOCKETT | 18 | Co Salford | 8:49.08 |
| 5 | 37 | George DAINTITH | 15 | Warrington W | 8:52.76 |
| 6 | 35 | Owen HATHWAY | 17 | Grantham | 9:23.41 |
| 7 | 33 | William HICKLIN | 14 | Co Leeds | 9:06.49 |
| 8 | 31 | Alfie BISBY | 16 | South Lincs | 9:07.14 |
| 9 | 29 | Patrick NEILL | 15 | Co Leeds | 9:04.45 |