wow! Thanks, drpalombella, for all the hard work :)
"using PN to identify something else in PN" is a cool idea. I need to try this on some of my old spottings.
Just in case the PN reference in my ID suggestion is too circular (using PN to identify something else in PN), here's a Wiki reference:
https://en.wikipedia.org/wiki/White-browed_Wagtail
Take a look at the various races of white wagtail, Motacilla alba, on Google Images or elsewhere. I think that's what you have here. If not M. alba, perhaps a different species.
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