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which is probably an old one by now - shows the top of C. sanguinolenta, and it looks like this. Unfortunately, the underside of that species isn't shown - only the belly of C. viridis, the Green Tortoise Beetle - and that underside also looks just like your photo.
See image at http://www.google.co.uk/imgres?imgurl=http://www.thewcg.org.uk/images/th...
Lat/Lng: 52.40461, 0.75421
OS grid ref: TL874820