Hi,
If there are more than 12 hours 'til end of auction and no bids click on More Actions to the right of the item and then on 'end listing'.
If you have bids, then it's not really good selling practice!:
http://pages.ebay.co.uk/help/sell/end_early.html
Also bear in mind that most bids are placed in the last few seconds of an auction.

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