EVENT 303 Open/Male 200m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Tymoteusz SIKORSKI | 12 | Team Luton | |
| 3 | 3 | Alexei RADCHUK | 14 | Ealing | |
| 4 | 7 | Ethan BARRON | 10 | Flitwick | 4:36.53 |
| 5 | 5 | Oscar MCILVANEY | 11 | Flitwick | |
| 6 | 2 | Samuel WOOD | 10 | Linslade | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Kai DE JUAN ENGLUND | 12 | Epping For't | 4:15.00 |
| 2 | 11 | Daniel CHAMBERLAIN | 14 | Harpenden | 4:00.70 |
| 3 | 13 | Mark KISS | 11 | Epping For't | 4:00.00 |
| 4 | 15 | James MCKINLEY | 11 | Bo Southend | 3:55.53 |
| 5 | 14 | Luke HANCOCK | 11 | Team Luton | 3:59.48 |
| 6 | 12 | Harvey CRIGHTON | 9 | Epping For't | 4:00.00 |
| 7 | 10 | Elijah POWELL | 12 | Linslade | 4:01.64 |
| 8 | 8 | James YAN | 11 | Epping For't | 4:30.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Alexander MCKAY | 11 | Epping For't | 3:51.66 |
| 2 | 20 | Alexander ROCHOWSKI | 13 | Linslade | 3:49.23 |
| 3 | 22 | Trey BEDEAU | 12 | Bletchley | 3:45.50 |
| 4 | 24 | William TURNER | 13 | Biggleswade | 3:33.00 |
| 5 | 23 | Guillaume TITOT | 14 | Epping For't | 3:38.26 |
| 6 | 21 | Hari GILL | 10 | Ealing | 3:46.12 |
| 7 | 19 | Alexandru ZAHARIA | 10 | Ealing | 3:51.50 |
| 8 | 17 | Dexter CRANE | 13 | Flitwick | 3:51.87 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Maximilian PETRAVICH | 12 | Team Luton | 3:30.00 |
| 2 | 28 | Theo TSANG | 12 | Ealing | 3:24.12 |
| 3 | 31 | Joshua BETT | 13 | Flitwick | 3:16.58 |
| 4 | 33 | Ben GORING-FARROW | 14 | Linslade | 3:13.20 |
| 5 | 32 | Alexander THANASSOULAS | 14 | Willesden | 3:15.27 |
| 6 | 30 | Patrick IANCU | 10 | Bo Southend | 3:20.00 |
| 7 | 27 | Yuma HAVERLY | 12 | Ealing | 3:28.20 |
| 8 | 25 | Xander CAMPBELL | 12 | Flitwick | 3:32.11 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 36 | Miles THOMAS | 12 | Flitwick | 3:11.36 |
| 2 | 38 | Maxim COLLINSON | 12 | Team Luton | 3:10.30 |
| 3 | 50 | George RHODES | 14 | Team Luton | 3:00.57 |
| 4 | 41 | Oliver OUTTRAM | 15 | Flitwick | 2:56.99 |
| 5 | 40 | Robert JAMES | 12 | Epping For't | 3:00.13 |
| 6 | 39 | Marcus XU | 13 | Linslade | 3:08.51 |
| 7 | 37 | Alfie RITCHIE | 13 | Broomfield | 3:11.05 |
| 8 | 34 | Leon CORNE | 13 | Co Cambridge | 3:11.81 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 43 | Joseph ELLIOTT | 16 | Flitwick | 2:55.13 |
| 2 | 45 | Rafe LAWSON | 13 | Berkhamsted | 2:51.08 |
| 3 | 47 | Dewi FORDYCE | 12 | Berkhamsted | 2:49.00 |
| 4 | 49 | Felix AMDOR | 14 | Broomfield | 2:38.80 |
| 5 | 48 | Luke TOLAND | 13 | Flitwick | 2:41.18 |
| 6 | 46 | Stewart BUTLER | 14 | Dunstable | 2:49.20 |
| 7 | 44 | Oscar RABENSTEIN TOBBA | 14 | Ealing | 2:54.60 |
| 8 | 42 | Alexander BELNIKOFF | 15 | Epping For't | 2:55.63 |