Class of arachnids, order of Opililones. Oval body and a single pair of eyes in the middle of the head.
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Yes, I think it could be Mitopus morio, legs seems to have some careneous edges, heavy legs, ocularium looks typical for M. morio, saddle is like in this species...
Lat/Lng: 51.2, 1.0
OS grid ref: TR1553