RAMSOR FARM, not Ramshorn Farm, as stated above.
As stated by Stubob, cup marked stone and channel/groove, with concentric rings.
Like a quarter of an oval stone, the ‘squared off corner’ having an obvious area with 2 concentric arcs, ie. a quarter of another cup and ringed structure... clearly this stone is part of something much bigger.
The curved edges seems to be deliberately manmade such that I believe it to be part of an oval cist slab, with multiple cup and ring and simple cup marked areas of rock-art.
I’ve had the chance to examine the stone very thoroughly, measurements taken, recorded accurately, to photograph from all angles with oblique lighting, etc