Seeing as there was no photos of the Long Stone, armed with an OS map printout - i set off to find it. I parked up next to the cattle grid and followed the footpath through the woods (this track can get quite boogy, so wellies are a must). The stone is about 50 metres down from the first right hand turn - about 3 metres right from the footpath. It's a small stone (about 0.5 metres high) and has a cruciform groove carved in about an inch deep. I didn't have my compass with me today so i can't show if the grooves are aligned in any way. Overall, a nice little hidden away stone - you've got to be a bit eagle-eyed due to its size (i walked past it once) but worth checking out if your in the area.
I went looking for a boundary stone called 'The Long Stone'. I didn't find the Long Stone but I did happen upon this lovely upright stone on the edge of a plantation. The stone is in an area that is completely stone-less and has as it's neighbours are a couple of low NYM burial mounds.
The stone is easy to find. Park up at the cattle grid at NZ786138 and then follow the footpath into the plantation keeping to the right branch along the fence. Wellies are definitely recommended.