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I can see why you would go for Nuthatch, as both are a similar colour above and both have a black mask. Nuthatch is a species built to walk down a tree, though; when it does come to the ground, it is short-legged and stands far less upright than a Wheatear. And, of course, Wheatear lives up to its name, with a huge white ar*e, which Nuthatch lacks!
My Flickr photos...
Of course it only lives up to its name if you speak Old (Middle?) English.
No, it always lives up to its name, irrespective of the linguistic capability of any human.
Northern as well? eh up
Lat/Lng: 53.4775, -3.0395
OS grid ref: SJ311983