Pillar taps are a pair of taps, deck ones are usually a mixer/filler so instead of a pair of taps you have one tap, both are designed to fit standard tap holes, the beauty of a deck filler though is that you can blend the water as you fill the bath. This link will probably help you...
( http://www.bristan.com/mainframeset.htm ) they do a good range from modern to traditional...
Hope that helps...
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