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Mid to late instar nymphs.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Would it be Tritomegas bicolor nymphs?
Many thanks, Chris. The various instars continue to baffle me because they do not seem to be illustrated - except by Wikipedia when you know what you are looking for!
Lat/Lng: 52.7494, 0.078
OS grid ref: TF403188