EVENT 201 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 1 | Oscar DAVISON | 10 | | Borocuda T | 7:26.50 |
| 4 | 3 | Shaun LIU | 9 | | Co Leeds | 7:00.00 |
| 5 | 2 | Joe DIXON | 10 | | Co Leeds | 7:15.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 5 | Finley GILL | 10 | | Co Leeds | 6:45.14 |
| 1 | 7 | Rumi JEEVA | 10 | | Co Leeds | 6:31.70 |
| 2 | 9 | Noah FLETCHER | 10 | | Chester Le S | 6:30.00 |
| 3 | 11 | Andre Nicholas ROTARU | 10 | | Co Leeds | 6:20.62 |
| 4 | 13 | Thomas HORSMAN | 12 | | Borocuda T | 6:05.70 |
| 5 | 12 | Charlie MACFADYEN | 12 | | Co Leeds | 6:17.10 |
| 6 | 10 | Aaron WATT | 12 | | Chester Le S | 6:25.00 |
| 7 | 8 | Josh HILTON | 10 | | Chester Le S | 6:30.00 |
| 8 | 6 | Archie TAGER | 11 | | Camden Swiss | 6:32.30 |
| 9 | 4 | Alexander HUTCHISON | 9 | | Co Leeds | 6:49.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 15 | George BEILBY-WOODWARD | 12 | | Co Leeds | 5:54.69 |
| 1 | 17 | Henry ROLLINGS | 11 | | Co Leeds | 5:50.77 |
| 2 | 19 | Jacob MANSON | 11 | | Borocuda T | 5:47.90 |
| 3 | 21 | Daniel RAWLINGS | 12 | | Co Leeds | 5:42.20 |
| 4 | 23 | Gleb KHARCHENKO | 11 | | Camden Swiss | 5:33.82 |
| 5 | 22 | Daniel BRIL | 9 | | Camden Swiss | 5:36.40 |
| 6 | 20 | Luca CHAKARDJIAN | 11 | | Camden Swiss | 5:46.90 |
| 7 | 18 | Asher WHITE | 12 | | Camden Swiss | 5:48.20 |
| 8 | 16 | Ryker BOYD | 11 | | Co Leeds | 5:53.37 |
| 9 | 14 | Edward KHONG | 11 | | Camden Swiss | 6:01.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 25 | Finn EASINGWOOD | 13 | | Co Leeds | 5:28.81 |
| 1 | 27 | Alex BOYD | 12 | | Co Leeds | 5:25.17 |
| 2 | 29 | Owen TEMPEST | 14 | S14 | Co Leeds | 5:18.70 |
| 3 | 31 | George RICKETTS | 12 | | Co Leeds | 5:12.70 |
| 4 | 33 | Ellis HARGREAVES | 13 | | Co Leeds | 5:03.96 |
| 5 | 32 | Aidan DRYDEN | 13 | | Chester Le S | 5:04.40 |
| 6 | 30 | Filippos STAVRIDIS | 13 | | Camden Swiss | 5:18.30 |
| 7 | 28 | Toma UDAKA | 11 | | Camden Swiss | 5:22.60 |
| 8 | 26 | David MCINTOSH | 9 | | Co Leeds | 5:28.39 |
| 9 | 24 | Harry MCDOWELL | 13 | | Copeland | 5:30.10 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 35 | James OZERSKY | 13 | | Camden Swiss | 5:00.60 |
| 1 | 37 | Tomas BICKERS | 13 | | Co Leeds | 4:57.20 |
| 2 | 39 | Joseph TODHUNTER | 15 | | Copeland | 4:39.90 |
| 3 | 41 | Oliver GLAISTER | 14 | | Workington | 4:32.10 |
| 4 | 43 | Benjamin PALMER | 15 | | Chester Le S | 4:30.10 |
| 5 | 42 | Jeffrey LANGE | 14 | | Co Leeds | 4:31.80 |
| 6 | 40 | Joshua WHITTON | 15 | | Chester Le S | 4:36.70 |
| 7 | 38 | Tyler CARR | 14 | | Chester Le S | 4:54.10 |
| 8 | 36 | Misha PROSYANKIN | 12 | | Camden Swiss | 5:00.10 |
| 9 | 34 | Harrison WAKE | 13 | | Co Leeds | 5:02.90 |