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When I saw the thread I thought of this very image macro.
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It's a Gregor Samsa
It is the larvae of the Harlequin Ladybird.
Originally from Asia it is an invasive species - although they do eat Aphids, they also eat our native Ladybirds. It is a pest - kill it.
You might want to visit http://www.harlequin-survey.org/ to record your sighting.
No, that's Dave.
Think its the other long lost Millband