Thats great FW thanks for that, it had to be a court tomb but as I said in my fieldnotes I am amazed by the uniformity of everything . A sign written on a boulder on the opposite sde of the road read Castlenageeha and this matched my OS map.
I presume that the road marks the townland boundary. I've been caught by that one many a time :-)
You can guess quite accurately when you have streams because they nearly always form townland boundaries, but you never know with roads: you never know how old they are.