This is another tomb that has disappeared in dense pine forest plantation. I have seen it marked on a few information boards around the area so there is a possiblity that it is there.
However there doesnt appear to have been any clearing left for it and there is a lot of stone lying around within the forest so makes it very difficult to pin down.
I went back to this a second time with a 10 digit ordnance survey reference.
Still couldnt find it and had a good root around some pretty scary looking forest so dont think it remains.