Wagtail - Motacilla alba/yarrellii
I've just spent over half an hour trying to decide if it is white or pied wagtail.
Reading this website -
just when I think I have got it sorted out I wrongly identify the next photo! The colour of the back and mantle, the level of grey on the flanks etc.
Melvyn posted a possible White wagtail recently which has lots of grey on the flank (indicative of Pied)
but nothing like as much as the bird on his next post which is pretty certainly a Pied.
So for me the jury is out, can anyone shed any light on it please.