Neil - Did Ebay give you any reason why they canceled the auction ? I had the same thing happen to me a couple of weeks ago but the auction of mine they canceled was for some Signed Federal Duck Stamps, I am still waiting for an answer from them as to why since there were several other auction for the same Duck Stamps.
About 2 years ago I had another auction canceled but it was becaus somebody told Ebay what I was selling was in violation of a fereral law.
Post any responce you might get from Ebay on the message board.
Walt