Looks quite fierce but only about 5mm long!
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Xysticus, yes, but I'm not convinced about this being robustus (which has only been rarely recorded in the UK and not near Bristol). The abdomen is wrinkled - maybe because she's just produced her egg case - and that's why no clear pattern is visble. The rest of the spider could pass for just a dark specimen of another Xysticus.
Thanks Alan. What other species do you think it could be? By the way it is more like 7mm in length.
Hi Jon, given the colour perhaps X lanio is the most likely but Xysticus is a genus I wouldn't even hazard a guess at from a photo (but maybe that's because I'm not very accomplished at IDing them). I found a darkish specimen of X kochi last year.
Lat/Lng: 51.4088, -2.5929
OS grid ref: ST588679