I know Andy Greenhalgh (AndyG) and one or two others have had a crack at talking them down. If I'm to believe what has been posted here, 25K was the last offer I heard that someone tried and was 'told where to go'.
What's a fair price? No way of saying; it's unique with almost no miles. Only thing is if you use it and enjoy it won't stay like that, as neither will the price it could command in the future, in fact pretty quickly. So it all depends if you are into 'stamp-collecting', or owning a car for driving, I suppose!
David