EVENT 255 Open/Male 14 Yrs/Under 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Thomas Ford | 11 | Wilmslow | 6:24.80 |
| 2 | 4 | Nikodem Dorsz | 12 | Co Liverpool | 6:13.60 |
| 3 | 7 | Alfred Whitell | 12 | Co Manch Aq | 5:57.60 |
| 4 | 9 | Oliver Sellers | 13 | Lancaster | 5:57.00 |
| 5 | 8 | Harry Prothero | 12 | Co Liverpool | 5:57.34 |
| 6 | 5 | Ewan Galloway | 12 | Wigan BEST | 6:07.02 |
| 7 | 2 | Harry Atkinson | 12 | Kendal | 6:17.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Myles Best | 13 | Co Liverpool | 5:53.61 |
| 2 | 14 | Antony Ziemer | 13 | Ramsbottom | 5:48.70 |
| 3 | 16 | Alfie Butterworth | 14 | Winsford | 5:45.10 |
| 4 | 18 | Long Him Ko | 14 | Altrincham | 5:39.60 |
| 5 | 17 | Logan Evans | 13 | Blackpool Aq | 5:43.55 |
| 6 | 15 | Emmett Eastwood | 13 | Aquabears | 5:46.10 |
| 7 | 13 | Thomas Ball | 13 | Co Liverpool | 5:52.30 |
| 8 | 11 | Ben Davidson | 12 | Workington | 5:54.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 20 | Albion Dobrushi | 13 | Co Liverpool | 5:34.80 |
| 2 | 24 | Finley Burke | 14 | Bolton Metro | 5:27.70 |
| 3 | 26 | Alex Murray | 14 | Warrington W | 5:27.18 |
| 4 | 29 | Kaloyan Nedyalkov | 14 | Workington | 5:23.50 |
| 5 | 28 | Jacob Wilson | 14 | Kendal | 5:25.70 |
| 6 | 25 | William Stamper | 14 | Co Liverpool | 5:27.32 |
| 7 | 23 | Daniel Rykowski | 14 | Leyland Barr | 5:29.30 |
| 8 | 19 | Alastair Buis | 14 | Carlisle Aq | 5:38.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Sebastian Boughen | 14 | Preston | 5:22.30 |
| 2 | 34 | Oscar O'Connell | 14 | Blackpool Aq | 5:19.18 |
| 3 | 37 | Ethan Craven | 13 | Warrington W | 5:10.88 |
| 4 | 39 | Leo Craven | 14 | Warrington W | 4:58.40 |
| 5 | 38 | Oscar Maddrell | 14 | Io Man | 5:05.85 |
| 6 | 36 | Ethan Dwyer | 14 | Co Liverpool | 5:16.81 |
| 7 | 33 | Tristan Carrasco Ruiz | 14 | Trafford Met | 5:21.30 |
| 8 | 30 | Ethan Prior | 14 | Leyland Barr | 5:22.30 |