EVENT 103 Open/Male 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Rowan Fletcher | 14 | Long Eaton | |
| 3 | 2 | Thomas Wainwright | 9 | Bedford SS | 2:07.87 |
| 4 | 3 | Jack Ardley | 10 | Leic Sharks | 2:05.86 |
| 5 | 4 | Rowan Meats | 11 | Hinckley | 2:04.16 |
| 6 | 5 | Sansar Dhami | 10 | Leic Sharks | 2:03.68 |
| 7 | 6 | Dexter Irving | 11 | Hinckley | 2:02.94 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Callum Jones | 11 | Leic Sharks | 1:57.98 |
| 2 | 8 | James Pickering | 11 | Hinckley | 1:55.00 |
| 3 | 9 | Sebastian Jones | 11 | Leic Sharks | 1:53.39 |
| 4 | 10 | Benjamin Parker | 10 | Calv Bing | 1:53.29 |
| 5 | 11 | Dylan Wright | 13 | Bedford SS | 1:51.89 |
| 6 | 12 | Spencer Cross | 11 | Melton M'bry | 1:51.58 |
| 7 | 13 | Isaac Smith | 11 | Hinckley | 1:50.00 |
| 8 | 14 | Cyril Bao | 10 | NottmLeander | 1:49.94 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Joshua Duckworth | 10 | Hinckley | 1:48.56 |
| 2 | 16 | Alfie Wheater-Lowe | 12 | NottmLeander | 1:46.20 |
| 3 | 17 | Zakariya Patel | 12 | Leic Sharks | 1:45.56 |
| 4 | 18 | Noah Berrington | 12 | Leic Sharks | 1:45.31 |
| 5 | 19 | Joel Gardner | 12 | Loughborough | 1:45.31 |
| 6 | 20 | Alf Coles | 11 | Leic Sharks | 1:45.18 |
| 7 | 21 | Henry Evans | 12 | Louth | 1:44.97 |
| 8 | 22 | Thomas Wittering | 13 | Hinckley | 1:42.53 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Toby Walker | 13 | Shepshed | 1:41.42 |
| 2 | 24 | Jacob Dockrell | 12 | Leic Sharks | 1:40.17 |
| 3 | 25 | Lucas Hales | 14 | Hinckley | 1:40.07 |
| 4 | 26 | Samuel Bone | 12 | Hinckley | 1:39.43 |
| 5 | 27 | Toby Paterson | 12 | Hinckley | 1:36.38 |
| 6 | 28 | Leo Stewart | 11 | Leic Sharks | 1:36.06 |
| 7 | 29 | Hudson Carter | 12 | Long Eaton | 1:35.91 |
| 8 | 30 | Ted Walker | 11 | Shepshed | 1:35.49 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Jacob Pawlyszyn | 12 | Wellingboro | 1:35.20 |
| 2 | 32 | Max White | 12 | Derby Excel | 1:34.40 |
| 3 | 33 | Ruari Hayden | 13 | NottmLeander | 1:34.10 |
| 4 | 34 | Albert Haile | 14 | Louth | 1:34.04 |
| 5 | 35 | Daniel Rata | 12 | Leic Sharks | 1:32.76 |
| 6 | 36 | Jacob Cliffe | 14 | Hinckley | 1:32.70 |
| 7 | 37 | Lok-Man Cheung | 12 | Leic Sharks | 1:32.65 |
| 8 | 38 | Zachary Evans | 14 | Louth | 1:32.24 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 39 | Charlie Newborough | 14 | NottmLeander | 1:32.05 |
| 2 | 40 | Seth Gardner | 15 | Loughborough | 1:31.85 |
| 3 | 41 | Charlie Tomlinson | 14 | NottmLeander | 1:30.87 |
| 4 | 42 | Theo Vandoros | 13 | Melton M'bry | 1:30.65 |
| 5 | 43 | Oliver Haggerty | 14 | Loughborough | 1:30.63 |
| 6 | 44 | Gregory Cross | 13 | Melton M'bry | 1:30.59 |
| 7 | 45 | Arthur Wainwright | 13 | Bedford SS | 1:29.48 |
| 8 | 46 | Clayton Christensen | 15 | Melton M'bry | 1:28.82 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 47 | George Zhang | 12 | NottmLeander | 1:28.00 |
| 2 | 48 | George Ridout | 13 | Bassetlaw SS | 1:27.50 |
| 3 | 49 | Horus Hui | 13 | Kingsbury | 1:27.30 |
| 4 | 50 | Lucas Willis-Culpitt | 14 | Leic Sharks | 1:24.98 |
| 5 | 51 | Charles Saturnino | 13 | NottmLeander | 1:22.10 |
| 6 | 52 | Jack Paterson | 16 | Hinckley | 1:21.78 |
| 7 | 53 | Samuel Hicks | 15 | Leic Sharks | 1:21.31 |
| 8 | 54 | Oliver Bisby | 15 | NottmLeander | 1:20.30 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 56 | Adam Allsopp | 17 | Leic Sharks | 1:19.55 |
| 2 | 58 | Kevin Varga | 13 | Co Leicester | 1:17.19 |
| 3 | 61 | Darell Yeoh | 17 | Loughborough | 1:11.70 |
| 4 | 63 | Christopher Oliver | 19 | Long Eaton | 1:09.42 |
| 5 | 62 | Hill Sam | 19 | Shepshed | 1:11.54 |
| 6 | 59 | Veljko Zivko | 16 | Bedford SS | 1:16.10 |
| 7 | 57 | Khaled Allam | 15 | Bedford SS | 1:19.31 |
| 8 | 55 | Chung Yin Kwok | 17 | NottmLeander | 1:19.60 |