11 September 1988 at Rhos-Y-Gadfa, Gobowen
| Unlimited | RH Sidecars | 500cc |
| 1- Graham Bell | 1- Mike Cookson & Peter Jones | 1- Paul Evans |
| 2- Rob Stacey | 2- Craig Cheatham & Chris Knowles | 2- Graham Bell |
| 3- Paul Timmins | 3- Nick Fumarola & Keith Wall | 3- Paul Timms |
| 350cc | 250cc | |
| 1- Gareth Roberts | 1- Dean Andrews | |
| 2- Rob Southwell | 2- Jim Rowlands | |
| 3- Pete Rowlands | 3- John Watkins |