I have removed the lid, and replaced the old vinyl with new marine vinyl from clark rubber, aluminium sheet proved too difficult to source the small size I needed and would have required 2 by curved cuts, I have also replaced the old stabilise gas struts and guess what , the lid now stays open by itself.
The worst part of the job was removing the old contact adhesive used a number of products a lot of scraping and elbow grease until in desperation I tried off the shelf oven cleaner which worked a treat. Who would have thought ?