EVENT 701 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 2 | Lewis WARREN | 10 | Co Sheffield | 5:12.70 |
| 4 | 4 | Ed PEARSON | 11 | Io Man | 5:06.89 |
| 5 | 3 | Jake THISTLEWOOD | 12 | Stockport Mo | 5:10.20 |
| 6 | 1 | Harry GARDNER | 11 | Co Sheffield | 5:34.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 6 | George ROBERTSON | 11 | Co Sheffield | 4:55.70 |
| 2 | 8 | Jacob BURTON | 10 | Swindon Dolp | 4:53.91 |
| 3 | 10 | Max MARSHALL | 09 | Co Sheffield | 4:48.40 |
| 4 | 12 | Harry OSBORNE | 11 | Co Sheffield | 4:35.80 |
| 5 | 11 | Carlos SIERRA VILLEGAS | 08 | Chesterfield | 4:45.31 |
| 6 | 9 | Gethin JENKS | 10 | Swindon Dolp | 4:51.60 |
| 7 | 7 | George TARTAKOVSKI | 09 | Co Sheffield | 4:54.50 |
| 8 | 5 | Corey OWENS | 10 | Stockport Mo | 5:02.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 16 | Jack COLLINS | 08 | Co Sheffield | 4:19.20 |
| 2 | 22 | Ridhwan MOHAMED | 00 | Bath Univ | 4:06.96 |
| 3 | 28 | Thomas SANSOME | 03 | Loughboro Un | 3:57.70 |
| 4 | 34 | Asterios DALDOGIANNIS | 97 | Loughboro Un | 3:47.57 |
| 5 | 31 | Reuben VISDA | 03 | Co Sheffield | 3:53.99 |
| 6 | 25 | Thomas WILKINSON | 06 | Chesterfield | 4:01.80 |
| 7 | 19 | Jacob BROWN | 07 | Tadcaster | 4:12.93 |
| 8 | 13 | Oliver CLAYDON SMITH | 10 | Co Sheffield | 4:32.10 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 17 | Joshua HARRIS | 01 | Tadcaster | 4:18.10 |
| 2 | 23 | Max RUSSELL | 06 | Co Sheffield | 4:04.88 |
| 3 | 29 | Jacob WHIBLEY | 05 | Co Manch Aq | 3:55.51 |
| 4 | 35 | Tyler MELBOURNE-SMITH | 05 | Lboro Uni | 3:45.74 |
| 5 | 32 | Sean MCCANN | 05 | Lboro Uni | 3:52.80 |
| 6 | 26 | Ben HARRISON | 00 | Loughboro Un | 4:01.30 |
| 7 | 20 | Findlay CORDLE | 07 | Repton | 4:11.50 |
| 8 | 14 | Dylan JAMIESON | 08 | Repton | 4:27.75 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 18 | Hao Hao SHI | 09 | Co Sheffield | 4:14.70 |
| 2 | 24 | Henrique MASCARENHAS | 01 | Bath Univ | 4:04.13 |
| 3 | 30 | R ROWBOTHAM KEATING | 05 | Lboro Uni | 3:54.00 |
| 4 | 36 | Lucas HENVEAUX | 00 | Lboro Uni | 3:45.50 |
| 5 | 33 | Ben COPE | 01 | Co Sheffield | 3:52.14 |
| 6 | 27 | Samuel TUCKER | 04 | Loughboro Un | 3:59.57 |
| 7 | 21 | Ethan ELLIS-SIXSMITH | 03 | Co Sheffield | 4:10.20 |
| 8 | 15 | Rossen MARTIN | 05 | Co Sheffield | 4:19.75 |