EVENT 515 Mens 11/14 Yrs 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 2 | James Gourpinar | 12 | Harlow Pen | 5:10.40 |
| 3 | 4 | Patch Robinson | 12 | teamipswich | 5:08.98 |
| 4 | 6 | Ethan Howard | 12 | Potters Bar | 5:05.53 |
| 5 | 5 | Massimo Girolami | 11 | Colchester | 5:05.88 |
| 6 | 3 | Joe Power | 12 | Basildon Ph | 5:10.30 |
| 7 | 1 | Daniel Thompson | 12 | Thurrock | 5:11.19 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 8 | Ashton Redhead | 12 | teamipswich | 5:00.31 |
| 2 | 10 | William Fawcett | 12 | Watford SC | 4:57.60 |
| 3 | 12 | Oliver Blight | 13 | Hatfield | 4:56.65 |
| 4 | 14 | Max Arnold | 13 | Harlow Pen | 4:56.20 |
| 5 | 13 | Jago Derrington | 13 | Bishop Stort | 4:56.41 |
| 6 | 11 | William Collowey | 13 | Epping For't | 4:56.92 |
| 7 | 9 | Ben Howlett | 12 | teamipswich | 4:58.95 |
| 8 | 7 | Reuben Alty | 11 | teamipswich | 5:03.44 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 16 | Joel Pietersen | 12 | Hatfield | 4:54.59 |
| 2 | 18 | Isaac Clare | 13 | teamipswich | 4:53.67 |
| 3 | 20 | Kian Quinlan | 13 | Bo Southend | 4:51.80 |
| 4 | 22 | Louis James | 13 | Thetford | 4:51.50 |
| 5 | 21 | Jack Juggins | 13 | Team Luton | 4:51.50 |
| 6 | 19 | Ryan Wall | 12 | Royston | 4:53.41 |
| 7 | 17 | Samuel Walsh | 13 | Witham Dolph | 4:54.58 |
| 8 | 15 | Daniel Kendall | 13 | Co Ely | 4:56.16 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 24 | Joshua Martin | 13 | Co Peterboro | 4:49.00 |
| 2 | 26 | Harvey Isle | 14 | West Norfolk | 4:46.56 |
| 3 | 28 | Safford Hewitt-White | 13 | Co Peterboro | 4:45.45 |
| 4 | 30 | Jenson Hurrell | 14 | Thurrock | 4:44.90 |
| 5 | 29 | Jack Abram | 14 | Co Norwich | 4:45.10 |
| 6 | 27 | Enzo Lim | 14 | Watford SC | 4:45.46 |
| 7 | 25 | Zak Troman | 12 | Colchester | 4:48.86 |
| 8 | 23 | Nathanial Mapley | 13 | Co St Albans | 4:49.22 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 32 | Oliver Rana-Beadle | 14 | Co Cambridge | 4:44.50 |
| 2 | 34 | Daniel McGuinness | 13 | Basildon Ph | 4:43.30 |
| 3 | 36 | Harry Sharpe | 14 | West Norfolk | 4:42.76 |
| 4 | 38 | Matthew Monie | 14 | Co Cambridge | 4:41.74 |
| 5 | 37 | Andrew Tembra | 13 | Hatfield | 4:42.70 |
| 6 | 35 | George Grice | 14 | Co Norwich | 4:42.80 |
| 7 | 33 | Mark Milburn | 14 | Colchester | 4:43.60 |
| 8 | 31 | Henry Newbury-Kemp | 14 | Watford SC | 4:44.84 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 40 | Finn Cooper | 13 | teamipswich | 4:41.07 |
| 2 | 42 | Elliot Gladwell | 14 | Hadleigh | 4:38.88 |
| 3 | 44 | Zak Baldwin | 14 | Newmarket | 4:38.46 |
| 4 | 46 | Nikita Charykin | 13 | Thurrock | 4:35.71 |
| 5 | 45 | Finley Coman | 14 | Norwich Swan | 4:37.97 |
| 6 | 43 | Matthew Baker | 13 | West Suffolk | 4:38.54 |
| 7 | 41 | Marin De Villard | 14 | St Felix Sch | 4:39.46 |
| 8 | 39 | Mitchell Tamblin | 14 | Norwich Swan | 4:41.33 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 48 | Denis Morine | 14 | Basildon Ph | 4:34.50 |
| 2 | 50 | Jacob Kitching | 14 | Chelmsford | 4:30.00 |
| 3 | 52 | Peter Soczewka | 14 | Hatfield | 4:25.53 |
| 4 | 54 | Oskar Farkas | 14 | Co Cambridge | 4:23.87 |
| 5 | 53 | Jude Hills | 14 | Thurrock | 4:24.30 |
| 6 | 51 | Olivier Vedrenne | 14 | Co Norwich | 4:29.90 |
| 7 | 49 | Aidan Pilcher | 14 | teamipswich | 4:33.83 |
| 8 | 47 | Daniel Clayton | 13 | teamipswich | 4:34.62 |