EVENT 703 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 1 | Ed PEARSON | 11 | Io Man | 1:22.19 |
| 3 | 3 | Jacob BURTON | 10 | Swindon Dolp | 1:15.63 |
| 4 | 5 | Tom HEY | 09 | Tadcaster | 1:11.21 |
| 5 | 4 | Mason GRADY | 10 | Stockport Mo | 1:14.30 |
| 6 | 2 | Mykhailo UNIIAT | 09 | Swindon Dolp | 1:18.26 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | James HENDON | 08 | Tadcaster | 1:09.13 |
| 2 | 9 | Harry OSBORNE | 11 | Co Sheffield | 1:08.70 |
| 3 | 11 | Luke WISE | 09 | Tadcaster | 1:06.10 |
| 4 | 13 | Harrison BYWATER | 07 | Loughborough | 1:04.83 |
| 5 | 12 | Henry SCULLY-PROUD | 07 | Loughborough | 1:05.22 |
| 6 | 10 | Aaryamaan SINGH | 08 | Swindon Dolp | 1:06.78 |
| 7 | 8 | Harry MOORE | 09 | Stockport Mo | 1:08.80 |
| 8 | 6 | Zachary STEPHENSON | 07 | Repton | 1:09.47 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 17 | Jack BROWN | 07 | Soundwell | 58.37 |
| 2 | 23 | Oliver SAUNDERS | 05 | Bath Univ | 56.88 |
| 3 | 29 | Isaac DODDS | 04 | Bath Univ | 55.98 |
| 4 | 35 | Aaron FOX | 01 | Co Sheffield | 53.20 |
| 5 | 32 | Joshua GOUGH | 04 | Loughboro Un | 54.10 |
| 6 | 26 | Oliver WATTS | 05 | Lboro Uni | 56.50 |
| 7 | 20 | Adel ACHELI | 02 | Co Sheffield | 57.40 |
| 8 | 14 | Alex BATES | 10 | Chesterfield | 1:04.40 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 18 | Harry MILNE | 08 | Repton | 58.10 |
| 2 | 24 | Harry ROBINSON | 04 | Lboro Uni | 56.60 |
| 3 | 30 | Thomas SANSOME | 03 | Loughboro Un | 55.39 |
| 4 | 36 | George BARBER | 01 | Co Sheffield | 52.70 |
| 5 | 33 | Samuel GREENBANK | 03 | Co Sheffield | 53.70 |
| 6 | 27 | Ellis CLEWORTH | 04 | Lboro Uni | 56.30 |
| 7 | 21 | Oisin TEBITE | 05 | NC Dublin | 57.22 |
| 8 | 15 | Gareon GABATAN | 08 | Rugby | 1:04.05 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 19 | Jakob GOODMAN | 00 | Loughboro Un | 57.66 |
| 2 | 25 | Rico BRINGEMAN | 05 | South Lincs | 56.60 |
| 3 | 31 | Leo POLLOCK | 06 | Repton | 55.20 |
| 4 | 37 | Calvin FRY | 04 | Loughboro Un | 52.60 |
| 5 | 34 | Luke IBBESON | 03 | Loughboro Un | 53.60 |
| 6 | 28 | Luke TUNSTALL | 05 | Lboro Uni | 56.10 |
| 7 | 22 | Callum RAYMENT | 99 | Co Sheffield | 57.10 |
| 8 | 16 | Freddie CARTER | 06 | Swindon Dolp | 59.20 |