EVENT 411 Boys Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | William WILSON | 13 | Co Leeds | 5:29.80 |
| 4 | 3 | Arthur OWENS | 14 | Co Leeds | 5:07.68 |
| 5 | 2 | Matei STOICESCU | 13 | Co Leeds | 5:29.71 |
| 6 | 33 | Shae BRYANT | 13 | Co Leeds | DQ: . |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Samuel JACKSON | 15 | Bo Kirklees | 5:11.50 |
| 2 | 7 | Shea WHITELEY | 17 | Ramsbottom | 5:07.94 |
| 3 | 9 | Matthew JAMES | 15 | Co Leeds | 5:05.79 |
| 4 | 12 | Finlay WILLIAMS | 19 | Leeds Uni | 5:16.18 |
| 5 | 11 | George BROOKS | 16 | Co Leeds | 4:55.02 |
| 6 | 8 | Benjamin ROSS | 15 | Co Salford | 5:10.92 |
| 7 | 6 | Louis CASS | 16 | Bo Kirklees | 5:08.59 |
| 8 | 4 | Samuel HILL | 14 | Co Leeds | 5:13.75 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 15 | Leo TAYLOR | 17 | Leyland Barr | DN:C. |
| 1 | 19 | Cameron RHODES | 18 | Rotherham Mo | DN:C. |
| 2 | 23 | Connor HARTLEY | 18 | Co Salford | 4:53.47 |
| 3 | 27 | Joseph ASHLEY | 15 | Warrington W | 4:42.96 |
| 4 | 31 | Davey UNWIN | 17 | Co Manch Aq | 4:59.32 |
| 5 | 29 | James ROBINSON | 18 | Co Leeds | 4:44.63 |
| 6 | 25 | James ESCOLME | 17 | Kendal | 4:55.67 |
| 7 | 21 | Dominic SIMPSON | 17 | Nuneaton | 4:49.99 |
| 8 | 17 | Matthew JUST | 15 | Co Leeds | 5:00.45 |
| 9 | 13 | Max HARVEY | 16 | Co Liverpool | DN:C. |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 16 | Charlie HINSON | 15 | Co Leeds | 4:59.32 |
| 1 | 20 | Charlie ROUNCE | 16 | Leamington | 5:03.45 |
| 2 | 24 | Lachlan BEAZLEY | 16 | Altrincham | 4:56.13 |
| 3 | 28 | Gabriel SHEPHERD | 15 | Co Leeds | 4:46.97 |
| 4 | 32 | Jack JENKINSON | 17 | Skipton | DN:C. |
| 5 | 30 | Finlay POPE | 16 | Stockport Mo | DN:C. |
| 6 | 26 | Jack SENIOR | 19 | Co Leeds | 5:03.74 |
| 7 | 22 | Alfie BISBY | 16 | South Lincs | DN:C. |
| 8 | 18 | Ronnie WEALL | 16 | Warrington W | DN:C. |
| 9 | 14 | Berdan ORDEK | 15 | Warrington W | 5:09.50 |