16 July 1978 at Chulmleigh
| Fastest over 350cc | RH Sidecar Open | Unlimited |
| 1- Gerry Smith | 1- Gerry Wheeler & S. Rattenbury | 1- Richard Elsick |
| 2- Neil Farnish | 2- Terry Skinner & Steve Martin | 2- Mike Davis |
| 3- Mike Davis | 3- ANOther | |
| Up to 350cc | RH Sidecar Expert | Juniors |
| 1- Neil Farnish | 1- Ken Jones & Steve Wheeler | 1- Roger Dunford |
| 2- Adrian Kessell | 2- Gerry Wheeler & S. Rattenbury | 2- Alex Chapman |
| 3- Richard Elsick | 3- Dick Parsons & Brian Parsons | 3- Mervyn Smallwood |
| RH Sidecars Juniors | RH Sidecar Open Unlimited | |
| 1- Kim Blackmore & Dave Pollard | 1- Roger Measor & Peter Dulake | |
| 2- John Bowerman & James Roppert | 2- Dick Parsons & Brian Parsons | |
| 3- ANOther | 3- Gerry Wheeler & S. Ratterbury |