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The triangular mark on S8 is the biggest clue here.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
that the straw-coloured ones are teneral?
Not a teneral but probably an immature drab form, as opposed to the blue form.
for the information.
Lat/Lng: 51.4435, -0.5589
OS grid ref: TQ002725