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I am not sure what makes this a juvenile female. Both young and adult sparrows undergo a complete moult in the late summer/autumn, and so are essentially the same by October or so.
My Flickr photos...
A small group of young Sparrows have been very regular visitors to the garden for many weeks and I have got to know them quite well and this individual is a female .
Lat/Lng: 51.5742, -0.4286
OS grid ref: TQ089873