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Sorry, can't see enough detail to suggest anything for that one. Did it have legs of any sort? Was it on a plant?
Entomologist and biological recorder
It was shimmying down a silken thread from the honeysuckle to the ground. No legs :)
Pre-pupating Alucita hexadactyla (Twenty-plume Moth)
Lat/Lng: 51.5, -0.1
OS grid ref: TQ3384