EVENT 401 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Jack HURRY | 12 | Northampton | 5:14.00 |
| 3 | 4 | Jack BIGNELL | 13 | Northampton | 5:07.70 |
| 4 | 3 | Eamonn DJERIDI | 13 | Royal Wolv | 5:09.80 |
| 5 | 1 | Jacob TAYLOR | 12 | Northampton | 5:21.40 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Manav MISTRY | 14 | Northampton | 5:02.70 |
| 2 | 8 | Sam GRAY | 14 | Northampton | 4:54.96 |
| 3 | 10 | Jasper JONES | 14 | Northampton | 4:46.40 |
| 4 | 9 | James BROWN | 19 | Royal Wolv | 4:51.90 |
| 5 | 7 | Harry CHANDLER | 13 | Royal Wolv | 4:56.07 |
| 6 | 5 | Oliver STONE | 13 | Derventio | 5:03.76 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | William EDWARDS | 15 | Royal Wolv | 4:42.61 |
| 2 | 14 | Harry CARDELL | 17 | Deepings | 4:34.10 |
| 3 | 16 | Brooke TOTNEY | 17 | Royal Wolv | 4:31.10 |
| 4 | 15 | Patrick WELSH | 16 | Derventio | 4:32.20 |
| 5 | 13 | Leo ALLANSON | 15 | Derventio | 4:34.86 |
| 6 | 11 | Benjamin GIBBONS | 14 | Northampton | 4:44.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | George WHITTLE | 15 | Derventio | 4:27.10 |
| 2 | 20 | Benjamin TWYNHAM | 16 | Co Derby | 4:20.69 |
| 3 | 22 | Harvey FREEMAN | 17 | Northampton | 4:17.70 |
| 4 | 21 | Finn DRYSDALE | 16 | Royal Wolv | 4:19.40 |
| 5 | 19 | Jean-Luc LOVELL-PASCAL | 16 | Royal Wolv | 4:24.99 |
| 6 | 17 | Sami PRYSOR | 14 | Royal Wolv | 4:27.35 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Oliver BURNS | 16 | Royal Wolv | 4:14.07 |
| 2 | 27 | Finley BUNHEJEE | 16 | Derventio | 4:10.10 |
| 3 | 29 | Liam DAWSON | 16 | Royal Wolv | 4:01.85 |
| 4 | 28 | Deen AHMED | 17 | Royal Wolv | 4:07.00 |
| 5 | 25 | Samuel LITTLER | 18 | Derventio | 4:13.65 |
| 6 | 23 | Razvan GRUMAZESCU | 17 | Northampton | 4:15.11 |