Thanks for your update,barons pierced the blisters when we took it to them for inspection and they were dry,on reflection we now think maybe respraying the existing roof might be the better option pr voiding they do a good job,replacing the roof, disconnecting every thing including the canvas and roof lining could be a recipe for other problems especially if they haven't done many,we wait to see what Mercedes decide ,just out of curiosity is it barons in Norwich that you are dealing with or do they have other branches?many thanks ,Millie