EVENT 503 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 2 | Ashley Hogg | 98 | Winsford | 4:40.56 |
| 4 | 4 | Joel O'Halleron | 96 | Derwentside | 4:38.49 |
| 5 | 3 | Kevin Wallbank | 96 | Derventio | 4:39.92 |
| 6 | 1 | Samuel Budd | 98 | Co Sheffield | 4:40.92 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 7 | James Reidy | 97 | Bo Kirklees | 4:35.83 |
| 2 | 11 | Alex Dunk | 95 | Prescot | 4:32.09 |
| 3 | 15 | Christopher Suggitt | 93 | Swim Swansea | 4:23.67 |
| 4 | 19 | Lewis Smith | 88 | Warrender Ba | 4:15.51 |
| 5 | 17 | Matthew Johnson | 95 | Bath Univ | 4:17.31 |
| 6 | 13 | Duncan Scott | 97 | F.I.R.S.T. | 4:24.53 |
| 7 | 9 | James Brown | 97 | IRL | 4:35.05 |
| 8 | 5 | Charlie Dentith | 95 | Plymouth Lea | 4:37.85 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 8 | Luke Thomas | 97 | Wycombe Dist | 4:35.79 |
| 2 | 12 | Fabian Whitbread | 92 | Co Oxford | 4:25.01 |
| 3 | 16 | Ross Muir | 91 | UniOfStirl | 4:18.97 |
| 4 | 20 | Roberto Pavoni | 91 | Loughboro Un | 4:12.24 |
| 5 | 18 | Max Litchfield | 95 | Co Sheffield | 4:16.61 |
| 6 | 14 | Thomas Paine | 94 | Co Manch Aq | 4:24.14 |
| 7 | 10 | Joe Litchfield | 98 | Donc Dartes | 4:32.66 |
| 8 | 6 | Aidan McDonagh | 97 | Bo Stockton | 4:36.78 |