3 September 1978 at Brompton Hall, Churchstoke
| Unlimited (Mid-Wales Centre C’ship) | RH Sidecars (Mid-Wales Centre C’ship) | Unlimited |
| 1- Steve Taylor | 1- Steve Smith & Trevor Pye | 1- Les Collins |
| 2- Cyril Jones | 2- Dave Heath & Ray Andrews | 2- T. Rawlinson |
| 3- Terry Owen | 3- Roger Measor & Peter Dulake | 3- Cyril Jones |
| 500cc | RH Sidecars | 350cc |
| 1- Les Collins | 1- Steve Smith & Trevor Pye | 1- Mark Wadsworth |
| 2- Steve Taylor | 2- Ken Jones & Steve Wheeler | 2- Andy Challinor |
| 3- Bruce Cribb | 3- Dave Heath & Ray Andrews | 3- Glyn Stanton |
| 250cc | ||
| 1- Mark Wadsworth | ||
| 2- Pete Morris | ||
| 3- Rob Homer |
9 April 1978 at Brompton Hall, Churchstoke
| Unlimited (Mid-Wales Centre C’ship) | RH Sidecars (Mid-Wales Centre C’ship) | Unlimited |
| 1- Simon Wigg | 1- Ken Jones & Steve Wheeler | 1- Tom Leadbitter |
| 2- Tom Leadbitter | 2- Ken Smith & Mick Burr | 2- S. Ryding |
| 3- Les Collins | 3- Pete Dyer & Dave Harris | 3- R. Beaumont |
| 500cc | RH Sidecars | 350cc |
| 1- Simon Wigg | 1- Steve Smith & Trevor Pye | 1- Mark Wadsworth |
| 2- S. Ryding | 2- Ken Smith & Mick Burr | 2- Phil Alderman |
| 3- Steve Taylor | 3- Gordon Matthews & Dave Higgins | 3- Gerald Short |
| 250cc | ||
| 1- Mark Wadsworth | ||
| 2- M. Perkins | ||
| 3- T. Rawlinson |