20 May 1990 at Letheringham
| 500cc | 350cc | 250cc |
| 1- Adrian Mower | 1- Lee Potter | 1- Kevin Lanchester |
| 2- Mark Woods | 2- Steve Hines | 2- Steve Hines |
| 3- Steve Daw | 3- Mark Whiteman | 3- Phil Ranson |
| RH Sidecars | 500cc Sidecars | |
| 1- Robert Baseby & Tony Baseby | 1- Brian Palmer & Shaun Kirk | |
| 2- Merv Ridgewell & Steve Fox | 2- Carl Squirell & Lynn Green | |
| 3- Joe Fisher & Carl Jasper | 3- Alan Peck & Simon Melson |