Argle. You must have been fairly close if you found the polisher*. It's no more than a couple of hundred metres vaguely SSE.
The refs Pete and I tried to determine and post here when you were asking a while back get are about as good as it gets I think. Unfortunately it was my pre-gps days, so Ive nothing more accurate. Soz Chris. Are you intending to go back for another pop at the cup-marked stone?
*Your pics of which are most pleasing to behold, it's a grand place Fyfield Down. Especially at dusk :)