Hi,
It's possible they made an error when they placed their max. bid e.g. put a dot in wrong place or an extra zero i.e. £110.
Open an Unpaid Item Dispute 4 days after listing end in order to get your final value fee refunded, so the buyer gets a strike on their account and so feedback can't be exchanged. Details of the process here:
http://pages.ebay.co.uk/help/sell/unpaid-items.html
Don't do a mutual cancellation as you risk the buyer not agreeing and then you won't receive the credit. Plus they can still leave feedback and won't receive a strike.
Add their ID to your blocked bidder list:
http://offer.ebay.co.uk/ws/eBayISAPI.dll?bidderblocklogin
Set your Buyer Requirements to block bidders with 2 or more unpaid item strikes:
http://offer.ebay.co.uk/ws/eBayISAPI.dll?BuyerBlockPreferences&guest=1&guest=1
Once you have closed the dispute you can relist.

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