I'm not sure quite how many issues there were but as far as I can find out it's just these 8 issues so far...
Denis Gifford's Complete catalogue of British comics dates this preview edition as June 1978
Issue 1 - October/November 
Issue 2 - Dec '78 / Jan '79
Issue 3 - February / March 
The worst cover of the whole run - you can see the colouring in!
Issue 4 - April / May 
Issue 5 - June / July 
A cheap collage cover
Issue 6 - August / September 
Another cheap collage cover
Issue 7 - October / November 
A 5p price rise but look at the improvement in the cover alone, the best cover to date - this could be on Action, new Eagle
And that's it (I think)
Coming soon! A look inside Wheels - it's an eclectic mix of foreign strips, I wonder where from, perhaps we'll never know.