EVENT 204 Open/Male 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 1 | Luke James | 14 | SB8 | BelperMarlin | 2:06.78 |
| 3 | 3 | Owen Johnson | 16 | SB9 | Repton | 1:20.52 |
| 4 | 5 | Brodie Butlin | 15 | | Nova Cent'n | 1:13.03 |
| 5 | 4 | Maxwell Millington | 15 | | Nova Cent'n | 1:13.43 |
| 6 | 2 | Bruce Dee | 18 | SB6 | Northampton | 1:21.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 7 | Edward Oscroft | 15 | | Northampton | 1:12.90 |
| 2 | 9 | Ellis Bancroft | 16 | | Loughborough | 1:12.73 |
| 3 | 11 | Edward Rosnovat | 15 | | Coalville | 1:12.28 |
| 4 | 13 | Jared Collins | 16 | | Sutton | 1:11.81 |
| 5 | 12 | Kenny Smith | 15 | | Co Leicester | 1:11.86 |
| 6 | 10 | Hayden Hudson | 14 | SB14 | Chesterfield | 1:12.55 |
| 7 | 8 | Aidan Fitzgibbon | 16 | | Co Lincoln P | 1:12.74 |
| 8 | 6 | Jake Battle | 13 | | Repton | 1:12.97 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 15 | Jack Zeravica | 16 | | Grantham | 1:11.63 |
| 2 | 17 | Finlay Underwood | 15 | | Rushden | 1:10.50 |
| 3 | 19 | Zach Hopkinson | 15 | | Grantham | 1:09.82 |
| 4 | 21 | Luke Chambers | 16 | | Derby Excel | 1:09.10 |
| 5 | 20 | Jack Smith | 14 | | Co Leicester | 1:09.82 |
| 6 | 18 | Niklas Saukko-Paavola | 16 | | Nova Cent'n | 1:10.30 |
| 7 | 16 | Harrison Grix-White | 16 | | Dronfield | 1:10.92 |
| 8 | 14 | Morgan Farrar | 15 | | Co Lincoln P | 1:11.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 25 | Alex Manley | 32 | | Lincoln Vulc | 1:08.02 |
| 2 | 31 | Joseph Wright | 15 | | Chesterfield | 1:06.40 |
| 3 | 37 | Cameron White | 22 | | Uni of Nott | 1:03.60 |
| 4 | 43 | Alexander Cohoon | 22 | | Lboro Uni | 1:00.50 |
| 5 | 40 | Tyler Tombs | 19 | | Nova Cent'n | 1:02.99 |
| 6 | 34 | Benjamin Roberts | 15 | | Grantham | 1:06.00 |
| 7 | 28 | Paul Page | 17 | | Hinckley | 1:06.87 |
| 8 | 22 | Max Holland | 16 | | Nova Cent'n | 1:08.88 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 26 | Eden Saint | 14 | | BelperMarlin | 1:07.44 |
| 2 | 32 | Aman Thethy | 16 | | Rushden | 1:06.35 |
| 3 | 38 | Adam Metcalf | 23 | | Loughborough | 1:03.22 |
| 4 | 44 | Harvey Freeman | 20 | | Lboro Uni | 1:00.23 |
| 5 | 41 | Joe Litchfield | 26 | | Lboro Uni | 1:02.00 |
| 6 | 35 | Oliver Caddick | 19 | | Lboro Uni | 1:05.90 |
| 7 | 29 | Daniel Oyaide-Nicholls | 18 | | NottmLeander | 1:06.80 |
| 8 | 23 | Max Balderson | 21 | | Rushden | 1:08.43 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 27 | Jacob Hodkinson | 17 | | Bassetlaw SS | 1:07.09 |
| 2 | 33 | Jaden Leo | 15 | | Derby Excel | 1:06.09 |
| 3 | 39 | Vadim Bosc | 19 | | Lboro Uni | 1:03.20 |
| 4 | 45 | Gregory Butler | 24 | | Lboro Uni | 58.20 |
| 5 | 42 | William Tonks | 16 | | Repton | 1:01.80 |
| 6 | 36 | Caleb O'Brien | 23 | | Corby | 1:04.61 |
| 7 | 30 | Aryan Nath | 15 | | Corby | 1:06.80 |
| 8 | 24 | Zachary Drayson | 15 | | Derby Excel | 1:08.40 |