6 April 1980 at Old Romney
| 500cc (2) | RH Sidecars (2) | 500cc (1) |
| 1- Trevor Banks | 1- Rob Wilson & Vaughan Roberts | 1- Don Godden |
| 2- Brian Webb | 2- Ken Thorpe & George Carter | 2- Trevor Banks |
| 3- Don Godden | 3- N. Shaw & P. Moss | 3- Duncan Tolhurst |
| 350cc | RH Sidecars (1) | 250cc |
| 1- Brian Webb | 1- Dennis Brewster & A. Rouse | 1- Jeremy Doncaster |
| 2- Dave Spain | 2- Ken Thorpe & George Carter | 2- Brian Cornelius |
| 3- Duncan Tolhurst | 3- T. Amos & A. Blewett | 3- Keith Sivier |