I think I agree with the above if the buyer really does want the item. If you are away then cash on colelction when you come back.
If the buyer still does not collect ( cash on collection) the do a non paying bidders dispute.
Do no agree to a mutual cancellation as if they refuse you will be left with the fees
Ebay says that if you have not received payment then you can open a non payment case after 4 days or up to 32 days.
Open a non paying bidder case after 4 days and close the case after 4 days of opening it. You get your fees back and the buyer gets a strike and cannot leave feedback.
At the side of the item click More actions then click Resolve a problem to open the dispute.
You should always sort out one sale before trying relisting or a second chance offer as you could potentially end up with two buyers and one item.
If they both paid you could end up with a non performing seller strike
Never do a mutual cancellation for a non payer as they could decline it and you would still have the fees to pay and they could leave feedback.
Non payers are time wasters.
Do not be tempted to leave positive feedback with a negative comment. This can be reported and removed and you will get a black mark on your account
Most people have their preferences set to block bidders with two strikes.
http://pages.ebay.co.uk/help/sell/block_bidders.html