Portsmouth 1978
Airport 78
29 October 1978 at Portsmouth Airport
| 350cc-500cc | RH Sidecars | 250cc – 350cc |
| 1- Graham Hurry | 1- Rob Stoneman & Rowland Broomfield | 1- Martin Hagon |
| 2- Bernie Leigh | 2- Roger Cant & Phil Stokes | 2- Adrian Kessell |
| 3- Clint Ward | 3- Pete Dyer & Dave Harris | 3- Bernie Leigh |
