The buyer would usually be expected to return the same way they got it. eBay's money back guarantee doesn't mention it specifically.
If you're worried you can issue a cancellation via the dropdown menu for the item on your orders page. Use the reason "Something wrong with buyer's address", ie. too far away to collect. If they've paid the refund will be issued in the process.
And put their ID on your blocked bidder list:
https://www.ebay.co.uk/bmgt/BuyerBlock