EVENT 31 Open/Male 200m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Alex BARTLE | 10 | Boston | 4:44.66 |
| 4 | 2 | Coen RUCK | 12 | Louth | 4:21.06 |
| 5 | 3 | Ciaran-James WESTERBY | 11 | Louth | 4:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Danielius MIEZETIS | 11 | Boston | 3:39.79 |
| 2 | 6 | Teddy LAWLOR | 11 | Louth | 3:22.00 |
| 3 | 7 | Liam EDMEADES | 10 | Deepings | 3:20.20 |
| 4 | 8 | George WHITE | 12 | Louth | 3:20.00 |
| 5 | 9 | Benjamin NOAKES | 12 | Louth | 3:17.92 |
| 6 | 10 | Hugo BRAILSFORD | 12 | Deepings | 3:11.40 |
| 7 | 11 | William PENNOCK | 12 | Grantham | 3:10.59 |
| 8 | 12 | Damir IVANOVS | 11 | Boston | 3:09.15 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Zachary LAWRENCE | 13 | Louth | 3:04.32 |
| 2 | 14 | Jacob STAPLES | 14 | Lincoln Vulc | 3:03.40 |
| 3 | 15 | Cameron JAMISON | 11 | Lincoln TSA | 3:01.41 |
| 4 | 16 | Benjamin GODDARD | 13 | Grantham | 3:00.52 |
| 5 | 17 | Elliot GLEAVE | 13 | Grantham | 3:00.01 |
| 6 | 18 | Brody LENTZ | 11 | Louth | 2:57.80 |
| 7 | 19 | Arthur ADAMS | 12 | Louth | 2:57.02 |
| 8 | 20 | Freddie HIRST | 11 | Grantham | 2:56.78 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Samuel GRIFFIN | 13 | Deepings | 2:50.85 |
| 2 | 24 | Henry DOLAN | 12 | Grantham | 2:47.38 |
| 3 | 26 | George LEONARD | 13 | Grantham | 2:44.65 |
| 4 | 28 | Oliver SHEPHERD | 16 | Deepings | 2:24.26 |
| 5 | 27 | Joshua HANKS | 16 | Louth | 2:31.60 |
| 6 | 25 | Henry WILLERTON | 12 | Skegness | 2:47.27 |
| 7 | 23 | Yu Ching (Eugene) CHEU | 14 | Grantham | 2:48.45 |
| 8 | 21 | Cameron MILNE | 13 | Deepings | 2:56.14 |