Once upon a time every farmyard hedgeline would have had a mix of birds like this.
No interactions present.
They are quite a common bird still around me, with one singing every 50 yards or less along some roads, locally, on the edge of the Yorkshire Wolds. The recent snow pulled some large flocks together, as well. But then we have loads of Tree Sparrows as well.
I can remember how unusual they were becoming down south when I used to live there 20 years ago, though.
My Flickr photos...
I'd be very happy indeed to see a little mix like that in my local hedges... Long gone (as a breeding bird) from Devon's countryside. Even the Yellowhammers have thinned out since I was a child - and that's not so long ago!
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Lat/Lng: 52.9, 0.6
OS grid ref: TF7544