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I don't know the species, but the white part is its eggs.
It is one of the Wolf Spiders (genus Pardosa). The white object is the egg sac, carried by the female until it hatches. She may also carry the newly hatched spiderlings on her back for several days.
British Dragonfly Society
Yes, I think you're right, thank you both.
Lat/Lng: 51.492, -2.5345
OS grid ref: ST629771