(Incorporating the National Inter-Centre Championship)
7 September 1958 at Mere
| 500cc | RH Sidecars | 350cc |
| 1- Murray Briggs | 1- Chris Vincent & Don Summers | 1- Murray Briggs |
| 2- John Gould | 2- Freddie French & ANOther | 2- Martin Tatum |
| 3- Lew Coffin | 3- Keith Blaynee & George Sanders | 3- John Gould |
| 4- D. Nourish | 4- J. Warren & ANOther | |
| Inter-Centre 500cc | Inter-Centre RH Sidecars | Inter-Centre 350cc |
| Southern | Midlands | South Eastern |
| J. Gould, L. Coffin, G. Gould & | W. Evans & ANOther | M. Tatum, M. Briggs, D. Godden & |
| J. Gale | K. Blaynee & G. Sanders | S. Jarvis |
| C. Vincent & D. Summers | ||
| Inter-Centre Solos Overall | ||
| South Eastern | ||
| M. Tatum, M. Briggs, D. Godden & | ||
| S. Jarvis |
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