Following a discussion with http://bit.ly/1Ievy9C, the difference being the Pied has much darker grey on their back and the black parts are larger.about the difference between Wagtail (Motacilla alba) species, this is an image taken recently in the UK of a Pied Wagtail as a comparison to the White Wagtail shown here
Thanks to Don for the detailed description of the differentiation of the sub-species.
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