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The square shaped mark on abdominal segment 8 is diagnostic.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks Chris! I will look out for that in future.
If the mark is triangular or house shaped it's a Common Blue. There are other ways of telling the 2 females apart but this is by far the most simple. Regards Chris.
Lat/Lng: 53.822644, -1.641792
OS grid ref: SE236363