Semi Final Mens 17/18 Yrs 100m Breaststroke
| Place | Name | AaD | Club | Time | FINA Pt | | 50 |
| 1. | Max Partridge | 18 | Co Sheffield | 1:04.53 | 810 | | 30.23 |
| 2. | Bobby Cave | 17 | Hatfield | 1:04.99 | 793 | | 30.81 |
| 3. | Mark Conroy | 17 | Plymouth Lea | 1:05.24 | 784 | | 30.37 |
| 4. | Nicholas Tawn | 17 | Carnforth | 1:05.63 | 770 | | 30.89 |
| 5. | Iain Scanlon | 18 | Dunedin ST | 1:05.66 | 769 | | 30.32 |
| 6. | Paul Sutherland | 18 | Kelly Coll | 1:06.01 | 757 | | 31.03 |
| 7. | Tom Rooke | 18 | Crawley | 1:06.76 | 732 | | 31.63 |
| 8. | Matthew Cope | 17 | Walsall | 1:07.13 | 720 | | 31.23 |
| 9. | Alex Wooldridge | 17 | Exeter City | 1:07.91 | 695 | | 32.29 |
| 10. | Danny Anderson | 18 | Guildford Ct | 1:08.50 | 677 | | 32.12 |
| 11. | Jonas Whitehead | 17 | Garioch | 1:08.79 | 669 | | 32.15 |
| 12. | James Nicholls | 17 | Wrexham | 1:08.97 | 664 | | 32.00 |
| 12. | Ben Jones | 17 | Co Cardiff | 1:08.97 | 664 | | 32.63 |
| 14. | York-Peter Kloppel | 18 | Reading | 1:09.38 | 652 | | 31.84 |
| 15. | Joseph Sowden | 18 | Co Leeds | 1:09.42 | 651 | | 31.78 |
| 16. | Simon Heffernan | 18 | Plymouth Lea | 1:09.58 | 646 | | 32.13 |
| 17. | Freddy Avenell | 17 | Nova Cent'n | 1:10.65 | 617 | | 32.72 |
| 18. | William Warburton | 17 | Halton | 1:11.34 | 600 | | 34.10 |
