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The greater coverts (those feathers with white tips forming the wing bar) have three feathers at the outer end which are not black, but dark grey...retained juvenile feathers which show it was born last year.
My Flickr photos...
If any of these feathers are still grey does it indicate a juvenile?
When the juvenile bird undergoes its first moult, in the autumn, it moults most of the greater coverts, but often retains the last two or three juvenile feathers. Rather than being black, with a white tip, like the new adult feathers, the juvenile feathers are paler and shorter than the adult ones. You can see that on this bird. When it moults again, in its second autumn, it will then be in full adult plumage.
Lat/Lng: 53.8682, -1.5869
OS grid ref: SE272414