EVENT 33 Open/Male 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Ciaran-James WESTERBY | 11 | Louth | 2:24.42 |
| 2 | 2 | James NICASSIO | 11 | Louth | 2:23.85 |
| 3 | 3 | Ted LIBELL | 10 | Louth | 2:20.00 |
| 4 | 4 | Edward BIRINY | 11 | Lincoln Vulc | 2:15.00 |
| 5 | 5 | Jacob KING | 10 | Louth | 2:10.00 |
| 6 | 7 | Zachary SMITH GOMEZ | 10 | Lincoln Vulc | 2:04.12 |
| 7 | 8 | Noah LAWRENCE | 10 | Louth | 2:03.37 |
| 8 | 9 | Danielius MIEZETIS | 11 | Boston | 1:59.99 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | George DOLAN | 9 | Grantham | 1:54.82 |
| 2 | 11 | Henry LEONARD | 9 | Grantham | 1:52.60 |
| 3 | 12 | Ethan PEART | 10 | Deepings | 1:50.19 |
| 4 | 13 | Theodore DONALDSON | 12 | Gainsborough | 1:50.00 |
| 5 | 14 | Henry EVANS | 12 | Louth | 1:44.97 |
| 6 | 15 | Daniel GODDARD | 11 | Grantham | 1:42.95 |
| 7 | 16 | Thomas HILLSON | 12 | Grantham | 1:41.00 |
| 8 | 17 | Hugo BRAILSFORD | 12 | Deepings | 1:40.19 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | William PENNOCK | 12 | Grantham | 1:37.20 |
| 2 | 19 | Benjamin SHEARN | 12 | Grantham | 1:37.08 |
| 3 | 20 | Bertie ROSE | 12 | Lincoln Vulc | 1:34.60 |
| 4 | 21 | Albert HAILE | 14 | Louth | 1:34.04 |
| 5 | 22 | Benjamin GODDARD | 13 | Grantham | 1:33.87 |
| 6 | 23 | Cameron MILNE | 13 | Deepings | 1:32.78 |
| 7 | 24 | Elliot GLEAVE | 13 | Grantham | 1:30.90 |
| 8 | 25 | Ollie BLANCHARD | 15 | Skegness | 1:29.03 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Oscar HE | 13 | Gainsborough | 1:19.00 |
| 2 | 29 | Chris WILLERTON | 41 | Skegness | 1:18.14 |
| 3 | 31 | Archie FRENCH | 16 | Lincoln Vulc | 1:14.58 |
| 4 | 33 | Alex MANLEY | 34 | Lincoln Vulc | 1:07.90 |
| 5 | 32 | Ryan NORTON | 18 | Boston | 1:10.65 |
| 6 | 30 | Ethan HUNTER | 15 | Lincoln Vulc | 1:15.26 |
| 7 | 28 | Reid HATCH | 13 | Gainsborough | 1:18.40 |
| 8 | 26 | Samuel GRIFFIN | 13 | Deepings | 1:22.37 |