Thanks for your help Ludo :--)
Have solved one problem where in a course turning editing on left a strange view with only the topic summary showing. Tracked this down to the presence of the dfwiki module. With this removed it course editing is back.
The wiki content is still not there.
Using phpmyadmin i can see the wiki table still hold to the original content.
ie 70 wikis and 3000 pages
The only thing I have noticed is that there is a reference to two group index keys
is this normal?
Do you think I should have another go at reinstalling the 1.8 Module? and the on up to