Ok, I think it is reasonably safe to conclude the following:
The C14 dating is the largest issue (but not the only issue) facing the authenticists. This matches my anecdotal experience with friends, family and colleagues (pretty much all secular) who when asked about the Shroud state either, “what’s the Shroud?” or for the older people “science has proved its a fake, it is irrelevant” (referring to the C14 dating).
The uniqueness problem is one of the largest (if not the largest) issue facing the sceptics. Nothing in this world is truly unique, so if something is…
Enough doubt has been cast on the C14 dating with new data to bolster its authenticity becoming available that my own position (as stated) is that I think it is authentic based upon the balance of probabilities.
In order to change people to believe in authenticity or that it is a fake to the test of beyond reasonable doubt, more concrete information needs to be available.
To that end, my next question to Mr Farey and undead_rat is the following:
If you were both (separately) given practically unlimited access with an unlimited budget with only 1 condition that you cannot damage the Shroud in any way (my Opus Dei hit team will monitor very closely), what test(s) would you and your crack team conduct to bring reasonable people to believe beyond reasonable doubt your side of the argument?
I apologise for the personalising of these questions, of course anybody can answer, but the leading protagonists seem to be the right people to answer the questions quickly.