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The extra pics help, but still not clear, for me. The tram lines are very pale. Some Redpolls are in-betweens and even in the hand can be hard to tell to species. I'd leave this one indeterminate.
My Flickr photos...
Redpoll taxonomy and identification is fraught and complex. Like that group subtle structural and morphological differences are used for segregation. In the case of the Redpolls into five (or six) recognisable(ish) forms: the Lesser Redpoll cabaret; the Common/Mealy Redpoll flammea; the North-western/Greenland/Icelandic Redpoll rostrata; the Hoary/Scandinavian Arctic Redpoll exilipes; and Hornemann's Arctic/Greenland Arctic Redpoll hornemanni. And of course, other than 'classic' individuals of each form, many individual birds cannot easily or confidently be placed into one group rather than another.
The most recent mtDNA study has found insufficient genetic evidence for the subdivision of the Redpoll group. Instead the evidence indicates that the three species that birders are used to considering at the moment (Lesser Redpoll (cabaret), Common Redpoll (flammea, rostrata, islandica) and Arctic Redpoll (exilipes, hornemanni) should be lumped into one species - presumably: The Redpoll.
Do you have a source for these recent studies?
Of course variation does exist within the Redpoll. It has been suggested that two well-known factors may be responsible for the variation in form of Redpolls. First, Bergmann's Rule describes the increase of size of individuals of a species with reduced temperatures. Second, Gloger's Rule descibes the increase in darkness of plumage with increase in humidity. So, these two observations would predict that the Redpolls living in western Europe would be darker, those in drier areas (such as in frozen landscapes) would be paler, those in the colder north would be larger and those living further south would be smaller.
It has also been suggested that these populations of Redpolls are incipient species that just have not had enough time to build up any significant genetic differences between one another. (Quoted: Morgithology.blogspot.co.uk)
Lat/Lng: 51.3199, 1.361
OS grid ref: TR342632