Pupa of Small Tortoiseshell looking suspiciously like an alien pod.
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Its a curious pupa as you say. A friend found a small tortoiseshell pupa recently and posted it on here, thats the only reason I went searching ukleps for a likeness to the pupa above- Peters pupa was gold and didnt have the hooked structure at the bottom.
Peter's (Peadar na breac's) pupa:
Lat/Lng: 51.488, -2.5322
OS grid ref: ST631766