EVENT 103 Open/Male 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Kan Kline GUIA | 9 | Team Luton | |
| 2 | 4 | Logan HESKETT | 9 | Dunstable | |
| 3 | 6 | Methuselah MAMMO | 15 | Berkhamsted | 2:16.14 |
| 4 | 8 | Henry PETCHEY | 11 | West Suffolk | 2:06.85 |
| 5 | 7 | Owen DONLAN | 10 | Team Luton | 2:08.42 |
| 6 | 5 | Philippe MARCELO | 10 | Dunstable | 2:17.08 |
| 7 | 3 | Albert GOSLING | 9 | Berkhamsted | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Krishi SINGH BRAR | 12 | Bletchley | 1:50.50 |
| 2 | 13 | Oliver PETCHEY | 13 | West Suffolk | 1:46.52 |
| 3 | 15 | Adam HANIF | 11 | Team Luton | 1:45.44 |
| 4 | 18 | Alexander ROCHOWSKI | 13 | Linslade | 1:44.38 |
| 5 | 17 | Finley TERRY | 13 | St Ives | 1:45.09 |
| 6 | 14 | Elijah UNSWORTH | 10 | Team Luton | 1:45.48 |
| 7 | 11 | William HORTON | 13 | Dunstable | 1:50.39 |
| 8 | 9 | Joseph COLLINS | 12 | Linslade | 2:02.59 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Oliver CREASY | 13 | West Suffolk | 1:36.46 |
| 2 | 23 | Charlie BRIDGEN | 15 | Linslade | 1:32.77 |
| 3 | 25 | Benji PERRY | 11 | Dunstable | 1:32.33 |
| 4 | 28 | Maximilian PETRAVICH | 12 | Team Luton | 1:26.42 |
| 5 | 27 | Luke THICKENS | 12 | Linslade | 1:29.82 |
| 6 | 24 | Noah TAYLOR | 15 | St Ives | 1:32.54 |
| 7 | 22 | George GOSLING | 11 | Berkhamsted | 1:36.37 |
| 8 | 20 | Aurman SINGH BRAR | 16 | Bletchley | 1:36.71 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Hanz Dylan MARCELO | 14 | Dunstable | 1:23.99 |
| 2 | 34 | James EVERETT | 14 | West Suffolk | 1:19.00 |
| 3 | 36 | Cem ADALI | 16 | Verulam | 1:16.12 |
| 4 | 39 | George EVERETT | 16 | West Suffolk | 1:12.69 |
| 5 | 38 | Rafe LAWSON | 13 | Berkhamsted | 1:15.60 |
| 6 | 35 | Elijah FISHER | 15 | Linslade | 1:17.82 |
| 7 | 33 | Harry VIDAL-GREENWOOD | 13 | West Suffolk | 1:21.68 |
| 8 | 30 | Marcus XU | 13 | Linslade | 1:25.60 |