Visited 16/2/15
This may be much more accessible in the future as they are currently starting work clearing the forest here. There were working diggers within 100m of this site creating a new forest clearing and if you use this new track you can get to the cairn without any risk of wet feet.
I took the opportunity today to capture a Google Photosphere so you can have a virtual look around yourselves: google.com/maps/views/view/109208834756377410190/gphoto/6116463123741184482
That's great Matt, thanks for posting the link here. I'm not really a fan of these dense modern forests, but this certainly gives atmosphere to the site at present.