10 June 1990 at Frittenden
| 500cc | RH Sidecars | 250cc |
| 1- S. Wilson | 1- Mike Baxter & Vince Roberts | 1- Ian Lee Amies |
| 2- C. Underhill | 2- Jerry Adams & S. Pittock | 2- R. Smith |
| 3- P. Mitchell | 3- Rob Wilson & Vince Jones | 3- Mark Giles |
| LH Sidecars | ||
| 1- G. Penfold & J. Spalding | ||
| 2- J. Fish & G. Moore | ||
| 3- J. Tysoe & J. Browning |