Search for items on other popular UK auction sites.
You can then easily compare the prices with those of completed auctions on eBay to determine your profit margin.
Some of these searches require you to be registered with eBay.
When you log in, select the "Keep me signed in" checkbox and you only need log in once for this session.
If you are not already registered you can quickly register here. It is easy and free.

 
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The following sites will be searched:

Search CQout only
Search Item name only
Search eBay UK only
Search Completed Auctions Item Name Only (Requires Login).
Use this to see what similar items have recently sold for.
Search eBid only
General auction search