EVENT 801 Open/Male 12 Yrs/Over 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Stanley PRESTON | 12 | White Cliffs | 6:35.40 |
| 3 | 3 | Ben CRANE TINGLE | 12 | Bromley | 6:27.40 |
| 4 | 6 | Callum GEOGHEGAN | 13 | Thanet Swim | 6:10.10 |
| 5 | 4 | Jack MILLAR | 12 | Bromley | 6:26.50 |
| 6 | 2 | Theo LOVELL | 12 | Bromley | 6:31.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 8 | Lenny LEWIS | 12 | Saxon Crown | 6:04.50 |
| 1 | 10 | Gabriel MARSH | 13 | RTW Monson | 5:58.30 |
| 2 | 12 | Rocco PALLEN | 12 | Dartford | 5:52.10 |
| 3 | 14 | Ho-Ching YAU | 13 | RTW Monson | 5:41.40 |
| 4 | 16 | Elliot HOGBEN | 14 | Herne Bay | 5:37.90 |
| 5 | 15 | Dane RAWKINS | 13 | Sevenoaks | 5:40.80 |
| 6 | 13 | Arian KURMANBAYEV | 14 | Tonbridge | 5:43.40 |
| 7 | 11 | Jax MARSHALL | 12 | RTW Monson | 5:53.00 |
| 8 | 9 | Oliver MARTEN | 13 | Maidstone SC | 5:59.60 |
| 9 | 7 | Harvey O'CONNELL | 13 | Erith & Dist | 6:08.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Maximillian MALODOBRY | 15 | Erith & Dist | 5:35.40 |
| 1 | 21 | Toby SIMMONS | 14 | Gravesend | 5:33.40 |
| 2 | 23 | George BEARDSMORE | 14 | Black Lion | 5:29.80 |
| 3 | 25 | Jackson LIMER | 16 | Black Lion | 5:28.80 |
| 4 | 27 | Euan KANE | 15 | Erith & Dist | 5:28.00 |
| 5 | 26 | Romeo BALL | 13 | Maidstone SC | 5:28.60 |
| 6 | 24 | Regan RAYNER | 16 | Thanet Swim | 5:28.90 |
| 7 | 22 | Ben TUSON | 16 | Gwich Royals | 5:31.80 |
| 8 | 20 | Nathan SAVAGE | 14 | Thanet Swim | 5:35.10 |
| 9 | 17 | Elijah LETTINGTON | 15 | RTW Monson | 5:36.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 31 | Haidn HOPKINS | 18 | Beachfield | 5:21.00 |
| 1 | 33 | Rohan BISSETT | 15 | RTW Monson | 5:18.50 |
| 2 | 36 | Thomas LOVE | 15 | Beckenham | 5:15.10 |
| 3 | 38 | Charlie BRAID | 14 | Bromley | 5:13.20 |
| 4 | 40 | Harri-James ISAACS | 18 | MwayMaritime | 5:10.20 |
| 5 | 39 | Charles DUNSTAN | 16 | Tonbridge | 5:11.30 |
| 6 | 37 | F MONTANARI BROWN | 18 | Gwich Royals | 5:15.10 |
| 7 | 34 | Harrison WILKINS | 14 | Maidstone SC | 5:17.00 |
| 8 | 32 | Oliver GOODE | 16 | Beckenham | 5:20.20 |
| 9 | 30 | Freddie MARTIN-YOUNG | 16 | RTW Monson | 5:21.14 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 42 | Finn JACKSON | 17 | Maidstone SC | 5:09.00 |
| 1 | 46 | Charley KING | 17 | Dover Life | 4:54.01 |
| 2 | 50 | Timothy LEBERL | 23 | Beckenham | 4:50.90 |
| 3 | 53 | Bryan DINEV | 19 | Bromley | 4:42.00 |
| 4 | 55 | Henry NORMAN | 18 | Bromley | 4:37.30 |
| 5 | 54 | Harry COCKS | 17 | Thanet Swim | 4:37.70 |
| 6 | 52 | Henry SHEPHERD | 15 | Bromley | 4:44.80 |
| 7 | 48 | Edward EVANS | 16 | Beckenham | 4:53.80 |
| 8 | 44 | Alexander TOLLIT | 18 | RTW Monson | 5:00.33 |
| 9 | 41 | Ayotunde DAUDA | 15 | Saxon Crown | 5:09.60 |