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In order to even make a guess, two photos are needed. One like this to show leg length, and another really close up/magnified to show details of the body, especially the front end where the eyes are. Body length is important, too, although this only works for adults. Yes, they are tricky!
The silk visible in the photo belongs to an orb weaving spider.
Lat/Lng: 50.52, -3.808
OS grid ref: SX719704