Not totally sure if my suggestion is correct but it does seem to match the features mentioned in my field guide but I'm hoping someone can agree/suggest otherwise, thanks!
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There are a number of similar species, none of which I'm familiar with and which need close examination to tell apart. Given the location and habitat, though, I strongly suspect you're right
Lat/Lng: 50.1606, -5.0984
OS grid ref: SW787335