Semi Final Mens 17/18 Yrs 100m Backstroke
| Place | Name | AaD | Club | Time | FINA Pt | | 50 |
| 1. | Karl Blurdis | 18 | Ireland | 57.40 | 829 | | 27.74 |
| 2. | Andrew Haslett | 18 | Warrender Ba | 59.09 | 760 | | 28.79 |
| 3. | Colm Dowling | 18 | Ireland | 59.29 | 753 | | 28.36 |
| 4. | James Cowburn | 17 | Stockport Mo | 59.44 | 747 | | 29.14 |
| 5. | Rikki Morris | 18 | Co Coventry | 59.77 | 735 | | 29.38 |
| 6. | Andrew Donaldson | 17 | Ren 96 | 59.87 | 731 | | 29.21 |
| 7. | Charles Walker | 18 | Co Peterboro | 59.94 | 728 | | 28.97 |
| 8. | Christopher Rowley | 18 | Bracknell | 1:00.22 | 718 | | 29.20 |
| 9. | William Warburton | 17 | Halton | 1:00.53 | 707 | | 29.12 |
| 10. | Thomas Bill | 18 | KingstonHull | 1:00.63 | 704 | | 29.59 |
| 11. | Graham Joyce | 17 | Co Milton K | 1:00.83 | 697 | | 29.34 |
| 12. | Kyle Barrett | 17 | Harrow Weald | 1:01.00 | 691 | | 28.98 |
| 13. | Joshua Robinson | 18 | Stockport Mo | 1:01.04 | 690 | | 29.39 |
| 14. | Daniel Waddingham | 18 | Nuneaton | 1:01.08 | 688 | | 29.42 |
| 15. | Richard Butler | 17 | KingstonHull | 1:01.14 | 686 | | 30.08 |
| 16. | David Smith | 18 | Falkirk | 1:01.36 | 679 | | 29.63 |
| 17. | Simon Rex | 18 | Bath Univ | 1:01.47 | 675 | | 29.95 |
| 18. | Christopher Ashton | 18 | Leatherhead | 1:01.99 | 658 | | 29.95 |
| 19. | Richard Harris | 18 | St Felix Sch | 1:02.35 | 647 | | 30.17 |
| 20. | Luke Ladbrooke | 17 | Wyre Forest | 1:02.63 | 638 | | 29.69 |
