I have been to this lost, just to the NE of the ones you mention.
http://uk.multimap.com/map/browse.cgi?X=486000&Y=457000&width=700&height=400&client=public&gride=&gridn=&srec=0&coordsys=gb&addr1=&addr2=&addr3=&pc=&advanced=&scale=25000&right.x=28&right.y=5
I really couldnt fathom them out, they are noit very high and some seem no more that bult up paths going up the hill. The ones lining the tops of the hill, seem just a little too far down to have been defensice.
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