7 May 1978 at Bagstone
| Experts | 500cc | Unlimited |
| 1- Gerry Smith | 1- Gerry Smith | 1- Clint Ward |
| 2- Mike Davis | 2- Clint Ward | 2- A. Williams |
| 3- A. Williams | 3- Ian Barclay | 3- Gerry Smith |
| 350cc | Junior | 250cc |
| 1- Clayton Williams | 1- Mark Jarvis | 1- Keith Richards |
| 2- Andrew Smith | 2- Roger Dunford | 2- Neil Farnish |
| 3- S. Balster | 3- Barney Ruddell | 3- Clayton Williams |