Semi Final Mens 17/18 Yrs 100m Butterfly
| Place | Name | AaD | Club | Time | FINA Pt | | 50 |
| 1. | Ewan Johnston | 18 | Warrender Ba | 56.10 | 784 | | 26.44 |
| 2. | Thomas Laxton | 18 | CarmarthenWP | 56.46 | 769 | | 26.28 |
| 2. | Karl Botha | 17 | Millfield | 56.46 | 769 | | 26.32 |
| 4. | Daniel Vickers | 17 | Stockport Mo | 56.60 | 763 | | 26.70 |
| 5. | Adam Taylor | 18 | Co Coventry | 57.14 | 742 | | 26.77 |
| 6. | Calum McGhee | 17 | Cumbernauld | 57.48 | 729 | | 27.01 |
| 7. | Jack Nunn | 18 | Ireland | 57.52 | 727 | | 27.04 |
| 8. | Ashley Dougan | 18 | Gloucester | 57.85 | 715 | | 26.58 |
| 9. | Keith Beveridge | 17 | Co Aberdeen | 57.92 | 712 | | 27.04 |
| 10. | Robin Williams | 18 | Co Birm'ham | 57.99 | 710 | | 27.23 |
| 11. | Matthew McCusker | 17 | Ren 96 | 58.19 | 703 | | 27.38 |
| 12. | Greig Wilkinson | 17 | Dun City Aqu | 58.46 | 693 | | 27.11 |
| 13. | James Davies | 17 | Swim Flint | 58.70 | 684 | | 27.28 |
| 14. | Matthew Henry | 18 | Kelly Coll | 58.73 | 683 | | 27.31 |
| 15. | James Welford | 17 | Co Newcastle | 58.75 | 683 | | 27.10 |
| 16. | Joshua Clough | 18 | Swim Flint | 58.81 | 681 | | 27.56 |
| 17. | Mark Saint-Clare | 18 | Millfield | 59.27 | 665 | | 27.54 |
| 18. | Joshua Finch | 17 | Burnley BOBC | 59.91 | 644 | | 27.59 |
| 19. | Oliver Summers | 17 | Portsmouth N | 1:00.17 | 635 | | 28.01 |
