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I found this on the leaf of a creeping buttercup in my field in Cambridgeshire. its less than a centimeter long. Sorry about the poor picture quality.
This is a scorpion fly, Panorpa spp.
There are three species in the UK (Pp. communis, cognata, germanica), and they are so similar they require expert analysis to ID.
The simply-pointed tip to the abdomen shows it is a female.
(The male's abdomen ends in what looks like a scorpion's stinger - hence the name 'scorpion fly'.)
Neither sex stings. However, the male can pretend to do so!
They have biting mouthparts, but I don't think they nip humans (anybody: tell me if you know otherwise!)
- http://thetopshamnaturalist.blogspot.com/2010/05/scorpion-flies.html (Tim Worfolk's excellent info on British scorpion flies)