Many thanks for the reply, Mike.
I had placed the link to the Auctiva Store in the "Contact Us" template of Seller's Details, which of course was then duplicated throughout my listings.
ebay only cancelled one listing for "listing violation", that being the biggest earner - a Gold Sovereign - I had to pull the rest of my listings and amend the template before re-posting.
Am still awaiting a response from ebay aabaout their decision.