EVENT 21 Boy Open 200m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Fabian KOLASA | 11 | Grantham | 4:10.00 |
| 2 | 2 | Oscar DURANT | 11 | Grantham | 3:52.00 |
| 3 | 3 | Robbie DUFF | 10 | Lincoln Vulc | 3:50.00 |
| 4 | 4 | Harry ELLIS | 11 | Louth | 3:29.36 |
| 5 | 5 | Matas RABASAUSKAS | 12 | Grantham | 3:29.33 |
| 6 | 6 | Austin TOMLIN | 12 | Lincoln Vulc | 3:28.18 |
| 7 | 7 | Lewis TOPHAM | 11 | Louth | 3:27.41 |
| 8 | 8 | Ashton HUNTER | 9 | Deepings | 3:22.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Henry SEAGROATT | 11 | Louth | 3:18.99 |
| 2 | 10 | Adrian ELERTS | 12 | Grantham | 3:18.42 |
| 3 | 11 | William KITE | 12 | Louth | 3:15.00 |
| 4 | 12 | Sam NGUYEN | 12 | Lincoln Vulc | 3:15.00 |
| 5 | 13 | James CASH | 12 | Deepings | 3:12.90 |
| 6 | 14 | William BURDOCK | 12 | Deepings | 3:11.50 |
| 7 | 15 | Layton ANNISON-SNOWDEN | 12 | Louth | 3:10.44 |
| 8 | 16 | Darell YEOH | 12 | Loughborough | 3:10.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Benjamin DERBY | 13 | Lincoln Vulc | 3:08.97 |
| 2 | 18 | Luke DAYBELL | 12 | Grantham | 3:07.80 |
| 3 | 19 | Jack BELL | 13 | Deepings | 3:07.54 |
| 4 | 20 | Oliver SHEPHERD | 12 | Deepings | 3:05.22 |
| 5 | 21 | Daniel HEPPLESTONE | 11 | Lincoln Vulc | 2:57.70 |
| 6 | 23 | Archie FRENCH | 12 | Lincoln Vulc | 2:53.48 |
| 7 | 24 | Oliver JONES | 13 | Lincoln Vulc | 2:53.39 |
| 8 | 25 | William TAYLOR | 14 | Louth | 2:47.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Henry SCULLY-PROUD | 15 | Loughborough | 2:41.89 |
| 2 | 29 | Daniel DEGNAN | 13 | Grantham | 2:36.82 |
| 3 | 31 | Jacob BRIERS | 14 | Deepings | 2:35.36 |
| 4 | 33 | Cade DEAVES | 16 | Grantham | 2:28.68 |
| 5 | 32 | Jake ADAMS | 14 | Louth | 2:33.26 |
| 6 | 30 | Jack HUGHES | 14 | Lincoln Vulc | 2:36.07 |
| 7 | 28 | Zach HOPKINSON | 13 | Grantham | 2:40.26 |
| 8 | 26 | Matthew LONGMAN | 15 | Loughborough | 2:42.75 |