EVENT 511 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 2 | David URSACHI | 13 | Leicester Ne | 5:59.94 |
| 4 | 5 | Jacob KING | 12 | Hinckley | 5:52.75 |
| 5 | 3 | Rahul REEDHA | 13 | Braunstone | 5:55.93 |
| 6 | 1 | Louis CURRIE | 14 | Coalville | 6:17.78 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | Oliver DORAN | 13 | Leic Peng | 5:49.50 |
| 2 | 9 | Rufus NUNN | 13 | Hinckley | 5:49.14 |
| 3 | 11 | Daniil OBUHOV | 13 | Braunstone | 5:40.13 |
| 4 | 13 | Nicholas LUNN | 12 | Coalville | 5:30.66 |
| 5 | 12 | Luke MORAN | 12 | Coalville | 5:37.43 |
| 6 | 10 | Alexander TURNER | 12 | Hinckley | 5:40.28 |
| 7 | 8 | Jake ALLEN | 12 | Braunstone | 5:49.44 |
| 8 | 6 | Logan MAGGS | 12 | Hinckley | 5:51.83 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 15 | Harry STATHAM-GILL | 13 | Coalville | 5:29.73 |
| 2 | 17 | Jacob TYRRELL | 11 | Leic Sharks | 5:20.29 |
| 3 | 19 | Michael FRASER | 11 | Hinckley | 5:13.33 |
| 4 | 21 | Andrei OBUHOV | 11 | Braunstone | 5:10.77 |
| 5 | 20 | John GRAHAM-BROWN | 12 | Leic Peng | 5:12.13 |
| 6 | 18 | Samuel HICKS | 11 | Hinckley | 5:19.00 |
| 7 | 16 | Ollie PERRINS | 12 | Loughborough | 5:29.29 |
| 8 | 14 | Jett LOCKTON | 12 | Braunstone | 5:30.04 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 23 | Seth GARDNER | 11 | Loughborough | 5:06.58 |
| 2 | 25 | Alex BARTLAM | 10 | Braunstone | 5:03.59 |
| 3 | 27 | Ryan HEJRATY | 10 | Leicester Ne | 5:02.30 |
| 4 | 29 | Callum SHIELLS | 08 | Leic Sharks | 4:58.40 |
| 5 | 28 | Ben ENGLAND | 10 | Melton M'bry | 4:59.82 |
| 6 | 26 | Kevin VARGA | 13 | Loughborough | 5:03.41 |
| 7 | 24 | Joshua HUDSON | 13 | Leic Sharks | 5:05.50 |
| 8 | 22 | Peter NIGHTINGALE | 10 | Coalville | 5:07.54 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 32 | Frank BACON | 10 | Braunstone | 4:53.84 |
| 2 | 34 | Jakub KOWALCZYK | 11 | Hinckley | 4:52.94 |
| 3 | 36 | William KING | 08 | Hinckley | 4:49.53 |
| 4 | 38 | Ryan HALES | 08 | Hinckley | 4:42.52 |
| 5 | 37 | Oliver SWAINE | 10 | Loughborough | 4:44.19 |
| 6 | 35 | Theo BLACK | 10 | Leic Sharks | 4:51.37 |
| 7 | 33 | William BURDOCK | 09 | Melton M'bry | 4:53.49 |
| 8 | 30 | Clay TUFFLEY-STEELE | 09 | Market Har | 4:57.40 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 40 | James HOCKEY | 09 | Coalville | 4:42.05 |
| 2 | 42 | Mason TRAYNOR | 13 | Coalville | 4:41.03 |
| 3 | 45 | Maxwell BURDETT | 12 | Leic Peng | 4:38.62 |
| 4 | 47 | Harry LUCAS | 10 | Braunstone | 4:29.23 |
| 5 | 46 | Charlie JAMES | 06 | Market Har | 4:31.35 |
| 6 | 43 | Kenny SMITH | 09 | Leic Sharks | 4:39.53 |
| 7 | 41 | Andrew BLAIR | 11 | Leicester Ne | 4:42.01 |
| 8 | 39 | Benjamin BOULTER | 08 | Leicester Ne | 4:42.52 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 52 | Jack GOLDFINCH | 06 | Loughborough | 4:24.67 |
| 2 | 54 | Jack SMITH | 10 | Leic Sharks | 4:22.60 |
| 3 | 56 | Oliver DAVIES | 09 | Leic Peng | 4:14.86 |
| 4 | 58 | Daniel HARRIS | 07 | Coalville | 4:04.15 |
| 5 | 57 | James LAKE | 07 | Loughborough | 4:12.53 |
| 6 | 55 | William OXLEY | 10 | Braunstone | 4:18.20 |
| 7 | 53 | Jacson CRABB | 11 | Leic Sharks | 4:22.75 |
| 8 | 50 | Lewis FITCH | 07 | Braunstone | 4:25.99 |