22 October 1978 at Bruton
| 500cc (Wessex Centre Championship) | RH Sidecars (Wessex Centre C’ship) | 350cc (Wessex Centre Championship) |
| 1- Bernie Leigh | 1- Roger Measor & Peter Dulake | 1- Gerald Short |
| 2- Alan Williams | 2- Pete Robson & Dave Hopes | 2- Graham Hurry |
| 3- Graham Hurry | 3- Terry Skinner & Steve Martin | 3- Mark Wadsworth |
| 250cc (Wessex Centre Championship) | RH Sidecars | Expert |
| 1- Mark Wadsworth | 1- Martin Heal & Trevor Seymoor | 1- Graham Hurry |
| 2- Bernie Leigh | 2- Pete Robson & Dave Hopes | 2- Simon Wigg |
| 3- Doug Dearden | 3- Roger Measor & Peter Dulake | 3- Tom Leadbitter |
| Juniors | Fasters RH Sidecars | Fastest |
| 1- Roger Dunford | 1- Roger Measor & Peter Dulake | 1- Gerald Short |
| 2- Phil Harris | 2- Richard Reberdy & Jim Head | 2- Graham Hurry |
| 3- Alan Hole | 3- Terry Skinner & Steve Martin | 3- Simon Wigg |
| Juniors | LH Sidecars | |
| 1- Phil Robson & S. Councill | 1- Mick Turrell & Tony Strevens | |
| 2- Clive Causer & Brian Rowsell | 2- Cliff Carter & Gary Ruffle | |
| ANOther | 3- Dave Penfold & Colin Cook |