EVENT 203 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | David URSACHI | 11 | Co Leicester | 2:00.48 |
| 3 | 4 | Oscar CUTMORE | 11 | Corby | 1:56.91 |
| 4 | 6 | Benjamin WHITE | 13 | Rushden | 1:51.94 |
| 5 | 5 | Finley KING | 12 | Wellingboro | 1:53.50 |
| 6 | 3 | Julius BERISHA | 11 | Wellingboro | 2:00.00 |
| 7 | 1 | Dylan BEGLEY | 10 | Market Har | 2:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Arsenii KORZUN | 12 | Newport Pag | 1:45.50 |
| 2 | 10 | Aethon WATTS | 17 | Kettering | 1:41.00 |
| 3 | 12 | Sui Chun YIP | 12 | Wellingboro | 1:35.00 |
| 4 | 14 | Aiden HORNE | 12 | Corby | 1:34.00 |
| 5 | 13 | Eric BUTANS | 13 | Corby | 1:34.30 |
| 6 | 11 | Oliver SHAN | 12 | Leic Sharks | 1:40.00 |
| 7 | 9 | Isaac JAMES | 13 | Wellingboro | 1:43.60 |
| 8 | 7 | Oliver TRENWITH | 11 | Corby | 1:45.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Adam SHAABAN | 15 | Leic Sharks | 1:30.01 |
| 2 | 18 | Frank BACON | 14 | Co Leicester | 1:26.50 |
| 3 | 20 | Ryan DOYLE | 13 | Kettering | 1:24.00 |
| 4 | 22 | William BEVITT | 16 | Kettering | 1:21.00 |
| 5 | 21 | Benjamin BAYES | 20 | Wellingboro | 1:21.70 |
| 6 | 19 | Jakub SIEDLAK | 13 | Corby | 1:25.99 |
| 7 | 17 | Zachary FRASER | 14 | Wellingboro | 1:29.10 |
| 8 | 15 | Jack PATERSON | 14 | Hinckley | 1:32.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Matin OLFATZADEH | 16 | Leic Sharks | 1:18.98 |
| 2 | 26 | Jacson CRABB | 13 | Co Leicester | 1:15.60 |
| 3 | 28 | Maxwell BURDETT | 12 | Co Leicester | 1:14.24 |
| 4 | 30 | Yogi PATEMAN | 16 | Wellingboro | 1:13.80 |
| 5 | 29 | Kais ALHIJAZI | 13 | Co Leicester | 1:14.20 |
| 6 | 27 | Callum SHIELLS | 16 | Leic Sharks | 1:15.20 |
| 7 | 25 | Arjun NAIR | 15 | Wellingboro | 1:17.00 |
| 8 | 23 | Sina MANI | 16 | Kettering | 1:20.90 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Aryan NATH | 15 | Corby | 1:10.60 |
| 2 | 34 | James PLENDERLEITH | 17 | Corby | 1:09.38 |
| 3 | 36 | Connor ALLEN | 17 | Wellingboro | 1:07.40 |
| 4 | 38 | Bobby PHILLIPS | 19 | Wellingboro | 1:05.30 |
| 5 | 37 | Harry FAULKNER | 18 | Wellingboro | 1:06.40 |
| 6 | 35 | Sebastian CASEY | 14 | Hinckley | 1:08.60 |
| 7 | 33 | Rishan CHUHAN | 15 | Sherwood | 1:10.56 |
| 8 | 31 | Mason ROUTLEDGE | 15 | Leic Sharks | 1:12.00 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Paul PAGE | 17 | Hinckley | 1:03.88 |
| 2 | 42 | Curtis MINNEY | 19 | Kettering | 1:02.20 |
| 3 | 44 | Tyler COLES | 18 | Daventry | 1:00.90 |
| 4 | 46 | Ethan SOPPETT-MOSS | 15 | Corby | 59.80 |
| 5 | 45 | James ANNABLE | 18 | Wellingboro | 1:00.00 |
| 6 | 43 | Ryan COLES | 19 | Daventry | 1:01.20 |
| 7 | 41 | Kieran FLINT | 26 | Market Har | 1:02.68 |
| 8 | 39 | Daniel DOYLE | 16 | Kettering | 1:04.60 |