This is typical of the digging and faecal deposit; the evidence is seen more often than the animal.
No interactions present.
Well Jo. I don't think you'll get many agreements here. But I have found some 'pretty' good lookalikes on the web, see- https://www.google.co.uk/search?safe=active&biw=1219&bih=846&tbm=isch&sa...
I suppose it does not look unlike young pony dung (I mean a young pony) and "...consist[s] of irregularly shaped lumps up to 7cm thick and approximately 10cm long.." http://www.britishwildboar.org.uk/index.htm?field.htm
Knowing how carefully you research these things and that the observation is in the right sort of place, I have no qualms about agreeing.
THREE MARINE PROJECTS
Certainly looks like boar; black and chunky with vegetation matter.
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