25 May 1980 at Old Romney
| 500cc | RH Sidecars (Jack Emmott Trophy) | 350cc |
| 1- Steve Schofield | 1- Rob Wilson & Vaughan Roberts | 1- Steve Schofield |
| 2- Brian Webb | 2- Charlie Coleman & Adam Cowper-Smith | 2- Duncan Tolhurst |
| 3- Dave Chambers | 3- Peter Mansell & Peter Finch | 3- Lee Bird |
| 250cc | ||
| 1- Bernie Edwards | ||
| 2- Mark Lewis | ||
| 3- Ray Watson |