Habitat = clearing within a wood
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It looks like a Squash Bug late instar nymph but I'm having trouble seeing enough detail in the images.
Can I ask a favour, could you over-lighten an image and upload it to this post.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
A couple of images added with contrast and brightness changed. Hope this helps and is what you meant - I haven't tried playing about with any images before!
A nymph of Coreus marginatus? - Dock Bug.
I saw a couple yesterday on our patch.
Dock Leaf Bug - Coreus marginatus as Grant suggests. There have been a lot of these around nearby and the shape is distinctive.
Thanks everybody for your help.
Lat/Lng: 51.6168, -0.004
OS grid ref: TQ382927