i got one of them from ebay myself a few months back for mid 40's including P+P, i thought it would have been worth about 90-100 myself but was shocked when i got it so cheap, dont know if it was just luck that i got it so cheap or if it was a slow day or what.
i ment to add that you put a reserve on it, but you know that.
if it was me, i wouldnt sell it for £40, id drink it first, it all depends on whos on as its ending or if you get a bidding war.