REF the above link....if you have sunroof problems, the link above I just mentioned is really superb. I printed off the relevant pages and then armed with them , went back to tackling the roof.
And the problem has been solved. Clue one was when , by chance , I found I could slide the inner roof lining back without the spring being connected. The workings were then revealed in all their glory and complexity. Choosing the correct diagrams from the link above then allowed me to wiggle this and that.....and being a bit geriatric, I finally realised that bits that should move were not moving because the parts were not CONNECTED CORRECTLY!!!
Someone had obviously been tinkering and not put it back together correctly. THEN of course could not tilt the roof to re-connect the spring.
So using the well drawn, and most importantly, colour coded manual pages, got everything back as it should have been and hey presto, everything worked perfectly.
Moral of the story is don't assume its right until you've checked everything over carefully and certainly don't force the roof as had I done so, possibly irreparable damage would have been done .
Lastly, huge thank you to whoever posted that link in one of the other sunroof related threads. It would have been impossible to solve without that diagram.