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Thanks are they common?
I think they are reasonably common, at least in the southern half of Britain (see NBN link above). I frequently see them after dark, when I'm out mothing; they are active at night on tree trunks, where I believe they graze on lichens/algae. See:
Entomologist and biological recorder
I think I may of seen them before, usualy in pairs?
Lat/Lng: 50.2238, -5.3074
OS grid ref: SW641412