My "Incomplete" book says it's a Froghopper. Can anybody confirm this. I don't think I have ever seen a Froghopper before.
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Yes, it is a froghopper. Follow the gallery links to froghopper families here:
(Yours has a family all to itself as far as the UK is concerned.)
Lat/Lng: 50.9, 0.6
OS grid ref: TQ8623