This morning I had an invoice from Ebay for £5.20. I immediately went to ask why am I being charged as I sold nothing, although I did place an add for an Iphone, I withdrew it after selling on gumtree. The person I spoke to gave me a full refund but advised me eBay policy is now to charge and directed me to the following paragraph at the end of the fees page.
If you end an auction early and buyers have already placed bids, you may be charged a fee. This fee is the same as a final value fee, based on the item price when you ended the auction. You won't pay a fee if you cancel your auction within the first 24 hours of listing your item, or if we have to end your auction.