EVENT 201 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Daniil Obuhov | 11 | Braunstone | 6:43.49 |
| 4 | 3 | Callum Taylor | 13 | Northampton | 6:30.00 |
| 5 | 2 | Ethan Woodward | 13 | Northampton | 6:35.96 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Oscar Williscroft | 14 | Long Eaton | 5:58.66 |
| 3 | 7 | Joshua Lane | 15 | Calv Bing | 5:48.36 |
| 4 | 9 | John Graham-Brown | 12 | Co Leicester | 5:40.76 |
| 5 | 8 | Ali Jamili | 12 | Co Leicester | 5:45.00 |
| 6 | 6 | James Oscroft | 11 | Northampton | 5:57.50 |
| 7 | 4 | Rory Smith | 12 | Co Leicester | 6:16.15 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Seth Gardner | 13 | Loughborough | 5:30.00 |
| 2 | 13 | Ryan Hejraty | 14 | Co Leicester | 5:09.97 |
| 3 | 15 | Arthur Blacklaws | 14 | Co Leicester | 5:04.55 |
| 4 | 17 | Andrew Blair | 13 | Co Leicester | 4:56.81 |
| 5 | 16 | Frank Bacon | 14 | Co Leicester | 5:00.26 |
| 6 | 14 | George Howard | 12 | Co Leicester | 5:09.35 |
| 7 | 12 | Andrei Obuhov | 13 | Braunstone | 5:29.69 |
| 8 | 10 | Louis Pell | 13 | Northampton | 5:40.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Gabriel Corbett | 14 | Leic Peng | 4:54.06 |
| 2 | 21 | Isaac Ebanks | 14 | Derby Excel | 4:51.81 |
| 3 | 23 | Emerson-Blu Gupwell | 14 | Co Leicester | 4:50.07 |
| 4 | 25 | Ethan Simmonds | 15 | Co Leicester | 4:49.49 |
| 5 | 24 | Kenny Smith | 15 | Co Leicester | 4:49.76 |
| 6 | 22 | Freddie Burdett | 14 | Co Leicester | 4:50.25 |
| 7 | 20 | Riley Woodward | 15 | Northampton | 4:53.03 |
| 8 | 18 | David Bielawski | 15 | Northampton | 4:56.50 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Maxwell Burdett | 12 | Co Leicester | 4:42.20 |
| 2 | 29 | Jack Smith | 14 | Co Leicester | 4:33.70 |
| 3 | 31 | Ethan Ford | 17 | Co Leicester | 4:23.10 |
| 4 | 33 | George Moore | 18 | Co Leicester | 4:05.89 |
| 5 | 32 | Daniel Harris | 17 | Co Leicester | 4:10.74 |
| 6 | 30 | Oliver Davies | 15 | Co Leicester | 4:29.70 |
| 7 | 28 | William Oxley | 14 | Co Leicester | 4:37.90 |
| 8 | 26 | Jacson Crabb | 13 | Co Leicester | 4:49.26 |