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Trev, this is a Pied Wagtail (Motacilla alba subsp. yarrellii). The black back and dusky flanks are right. Your ID is still correct but this takes it closer. Chris
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks gents. Yes it's a Yarrellii with black back.
Lat/Lng: 50.2865, -3.6454
OS grid ref: SX828442