EVENT 508 Boys 12 Yrs/Over 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Samuel Barnett | 12 | Potters Bar | 21:17.63 |
| 4 | 3 | William Fawcett | 12 | Watford SC | 21:09.28 |
| 5 | 2 | Theo Lim | 13 | Watford SC | 21:17.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 5 | Jake Williamson | 14 | Hatfield | 20:51.97 |
| 3 | 7 | Ethan Howard | 12 | Potters Bar | 20:46.59 |
| 4 | 9 | Ryan Wall | 12 | Royston | 20:33.40 |
| 5 | 8 | Jack Barnard | 14 | Potters Bar | 20:33.82 |
| 6 | 6 | Daniel Holliss | 13 | Co St Albans | 20:48.91 |
| 7 | 4 | Marko Borgis | 13 | Stevenage | 21:04.57 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 11 | Jason Ho | 13 | Hatfield | 20:14.47 |
| 2 | 13 | Enzo Lim | 14 | Watford SC | 19:04.39 |
| 3 | 15 | Max Robertson | 15 | Hatfield | 18:24.57 |
| 4 | 17 | Ahaan Saini | 15 | Hatfield | 17:58.14 |
| 5 | 16 | Zane Batt | 16 | Hoddesdon | 18:16.22 |
| 6 | 14 | Henry Newbury-Kemp | 14 | Hemel Hemp | 19:03.76 |
| 7 | 12 | Joseph Sutton | 14 | Watford SC | 19:10.35 |
| 8 | 10 | Jake Moore | 13 | Potters Bar | 20:32.47 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 19 | James Pope | 16 | Watford SC | 17:53.40 |
| 2 | 21 | Adam Evens | 17 | Hitchin | 17:21.23 |
| 3 | 23 | Callum Wollaston | 18 | Cheshunt | 17:02.40 |
| 4 | 25 | Michael Klimaszewski | 15 | Hatfield | 16:11.06 |
| 5 | 24 | Jude Liddiard | 18 | Co St Albans | 16:38.10 |
| 6 | 22 | Daniel English | 17 | Hitchin | 17:05.14 |
| 7 | 20 | Ethan Sutton | 17 | Watford SC | 17:33.17 |
| 8 | 18 | Peter Soczewka | 14 | Hatfield | 17:53.76 |