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The Marbled White occurs mainly in the southern half of the UK. Most sightings are from Yorkshire southwards.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
There are a few outlying colonies "oop North" (Wingate Quarry in Co. Durham, for instance), but they're not common at all.
Lat/Lng: 56.4, -6.2
OS grid ref: NM4239