Just for the record, it’s still raining up there! The horizontal stuff that soaks you right through...
The bracken was only just sprouting, so I had no problem in finding it, though for some reason I had some doubts until a passing(!) farmer confirmed that this was indeed what I was looking for.
I can only re-iterate Mr Hamhead’s directions – it’s actually a relatively easy walk up the hill, with a couple of streams to cross, but the upright stone is quite distinctive and easily spotted from below.