Arrived by the outside light last night. seems to have only 2 eyes and 10 legs. 85mm total leg span, body 3mm wide x 5mm long. Walks like a harvestman
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Beaten to it by lithopian whilst I was typing/checking my id, good to know I was on the right track!
Thank you all. Very useful
Lat/Lng: 51.520573, -1.54518
OS grid ref: SU316802