EVENT 634 Boy 11/14 Yrs 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Alexander Pattison | 12 | West Norfolk | 6:26.80 |
| 2 | 4 | S Newman-Baronius | 12 | Putteridge | 6:05.96 |
| 3 | 6 | Philip Spalding | 12 | Putteridge | 6:02.60 |
| 4 | 8 | Evan Larthe | 13 | Basildon Ph | 6:02.30 |
| 5 | 7 | Alexander Gaydon | 12 | teamipswich | 6:02.47 |
| 6 | 5 | Jacob Bacon | 12 | Co Peterboro | 6:04.66 |
| 7 | 3 | Chiu Ki Cheng | 11 | Co St Albans | 6:25.52 |
| 8 | 1 | Mawulinam Ito | 11 | Co Cambridge | 6:29.15 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Brandon Crees | 11 | Basildon Ph | 6:00.99 |
| 2 | 12 | William Wratten | 13 | Co Cambridge | 6:00.17 |
| 3 | 14 | Harry Bird | 13 | Putteridge | 5:51.40 |
| 4 | 16 | Csanad Rehus | 13 | Co Peterboro | 5:46.19 |
| 5 | 15 | Marton Molnar | 13 | Co Cambridge | 5:49.55 |
| 6 | 13 | William Hughes | 12 | Basildon Ph | 5:55.04 |
| 7 | 11 | Toby Owen | 13 | Southend | 6:00.44 |
| 8 | 9 | Kai Patel | 12 | Thurrock | 6:02.26 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Lazaros Giarenis | 13 | Co Norwich | 5:44.40 |
| 2 | 20 | Oliver Fenwick | 13 | Team Luton | 5:43.59 |
| 3 | 22 | Adam O'Neal | 14 | Modernian | 5:42.10 |
| 4 | 24 | Ben Humphries | 14 | Maldon Shark | 5:40.99 |
| 5 | 23 | Cooper Smith | 13 | Harlow Pen | 5:41.44 |
| 6 | 21 | Matt Phoenix-McGlynn | 14 | Norwich Swan | 5:42.23 |
| 7 | 19 | Harrison Waller | 13 | Southend | 5:43.91 |
| 8 | 17 | William Lockwood | 13 | Hatfield | 5:45.37 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | George Carter | 14 | Co Cambridge | 5:39.47 |
| 2 | 28 | Dmitrijs Gracovs | 13 | Harlow Pen | 5:35.90 |
| 3 | 30 | Lewis Masson | 14 | Linslade | 5:35.30 |
| 4 | 32 | Ben Every | 14 | St Felix Sch | 5:32.79 |
| 5 | 31 | Daniel De Filippo | 13 | Flitwick | 5:33.00 |
| 6 | 29 | Harry Phelan | 13 | Basildon Ph | 5:35.58 |
| 7 | 27 | Juan Modolell | 14 | Co Cambridge | 5:39.22 |
| 8 | 25 | Jamie Wilson | 13 | West Norfolk | 5:40.90 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Tobi Olajide | 13 | Thurrock | 5:31.40 |
| 2 | 36 | Naim Harvey | 14 | Basildon Ph | 5:25.70 |
| 3 | 38 | Henry Mann | 14 | Norwich Swan | 5:22.50 |
| 4 | 40 | Ross De Wildt | 14 | Co Cambridge | 5:15.45 |
| 5 | 39 | Ethan Thorpe | 13 | Basildon Ph | 5:20.48 |
| 6 | 37 | Remi-Maysen Keane | 14 | Basildon Ph | 5:24.41 |
| 7 | 35 | Jude Gunner | 13 | St Felix Sch | 5:27.15 |
| 8 | 33 | Daniel Williams | 14 | Hatfield | 5:31.80 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Robert Fenner | 14 | Basildon Ph | 5:11.05 |
| 2 | 44 | Sean Connolly | 14 | Epping For't | 5:08.25 |
| 3 | 46 | Joshua Sackree | 14 | Co Peterboro | 5:03.23 |
| 4 | 48 | Orlando Dearing | 14 | Co Peterboro | 4:59.83 |
| 5 | 47 | George Prince | 14 | Hatfield | 5:02.39 |
| 6 | 45 | Massimo Girolami | 14 | Colchester | 5:07.60 |
| 7 | 43 | Kian Lee | 14 | Co Peterboro | 5:10.55 |
| 8 | 41 | Oscar Winterburn | 14 | teamipswich | 5:13.83 |