A newly emerged female dusting itself down ready for the off perhaps? see Comment
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I am wondering what the banded structure protruding from the end of the abdomen is; it looks too structured to be faeces and it has an orifice (Image 1). Anus, ovipositor? It appears retractable (cf. Images 2 and 3).
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707