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The brown uppers, chest-band and rump make it Sand M. House would be blue above, have a white rump and no chest-band, Swallow would have no chest-band and be blue (or thereabouts) above.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Lat/Lng: 55.2427, -1.6231
OS grid ref: NZ240943