On my way back from the Rath I had another good snoop around for the standing stone. Especially since it is mentioned on the fairly recent looking information board at the Rath.
Still no sign so I decided to stop in at the farm nearby where I could hear so activity going on.
As I drove in there on my left beside the swing was the standing stone.
I talked to the farmer and he said he had moved it to his yard for safety.
It is a fine standing stone about 2m-2.3m.