is this a juvenile or adult female
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Gut feelng is that it is an adult, but it is not easy to see features like the shape of the dark tip on the outer tail feather...etc., to be certain of the age.
My Flickr photos...
The tip of the tail is usually a much stronger white colour in adults, it appears quite a buff colour in this shot.
Not sure if this helps or hinders!
Lat/Lng: 52.7455, 1.6361
OS grid ref: TG455226