EVENT 304 Mens Open 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | David Gillespie | 15 | Corby | 26.80 |
| 2 | 3 | Brinley Dorrell | 15 | Woking | 26.75 |
| 3 | 5 | James Hart | 14 | Plymouth Lea | 26.70 |
| 4 | 7 | Jack Allan | 15 | TigersJersey | 26.62 |
| 5 | 6 | Akal Rehal | 15 | Co Leeds | 26.65 |
| 6 | 4 | Louis Hayes | 14 | Sevenoaks | 26.73 |
| 7 | 2 | Samuel Tucker | 14 | Wycombe Dist | 26.79 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Salvador Gordo | 15 | Plymouth Lea | 26.50 |
| 1 | 17 | Ned Sharp | 15 | Skipton | 24.96 |
| 2 | 23 | Harry Stacey | 18 | Shiverers | 24.85 |
| 3 | 29 | James Watson | 18 | Crewe Flyers | 24.60 |
| 4 | 35 | Cristian Rotundu | 24 | Co Derby | 24.09 |
| 5 | 32 | Jamie Ingram | 20 | Co Manch Aq | 24.44 |
| 6 | 26 | Alessandro Burdisso | 18 | Mt Kelly | 24.67 |
| 7 | 20 | Thomas Carswell | 18 | Tadcaster | 24.86 |
| 8 | 14 | Ellis Morgan | 15 | Wycombe Dist | 26.33 |
| 9 | 8 | Jamie Hanss | 15 | Co Milton K | 26.59 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Sam Townsend | 14 | C Beds SS | 26.50 |
| 1 | 18 | Warren Barrett | 31 | Exeter City | 24.91 |
| 2 | 24 | David Thompson | 25 | Bangor IRL | 24.77 |
| 3 | 30 | Freddy Clampett | 20 | Plymouth Lea | 24.60 |
| 4 | 36 | Brian O'Sullivan | 23 | Loughboro Un | 23.99 |
| 5 | 33 | Cameron Brooks-Clarke | 19 | Co Sheffield | 24.41 |
| 6 | 27 | Sean McNicholl | 17 | Hamilton UAE | 24.67 |
| 7 | 21 | Matthew Domville | 21 | Warrington W | 24.85 |
| 8 | 15 | Jay Cushen | 15 | Winsford | 26.16 |
| 9 | 9 | David O'Loughlin | 14 | Millfield | 26.58 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 13 | Patrick Heeks | 15 | Pershore | 26.34 |
| 1 | 19 | Thomas Beeley | 19 | Plymouth Lea | 24.90 |
| 2 | 25 | Ryan Flanagan | 24 | East Leeds | 24.70 |
| 3 | 31 | Matthew Henry | 28 | Dartmoor DA | 24.44 |
| 4 | 37 | Sam Horrocks | 24 | Co Manch Aq | 23.91 |
| 5 | 34 | Edoardo Valsecchi | 21 | Plymouth Lea | 24.11 |
| 6 | 28 | Kevin Wallbank | 22 | Loughboro Un | 24.66 |
| 7 | 22 | Jacob St-Germain | 18 | Millfield | 24.85 |
| 8 | 16 | Calvin Fry | 14 | Millfield | 25.74 |
| 9 | 10 | William Ellington | 15 | Millfield | 26.51 |