It was a sad story. The farm was bought by a "born-again" Baptist who wanted no "pagan idols" on his land, so he tore down the stone, breaking a few inches off the top, and dumped it in the nearby hedge, covering it in chicken wire, around which weeds grew and climbed, so hiding it from sight. The stone was not a Scheduled Ancient Monument, so the law could not be brought to bear on the culprit, who thankfully sold the place and moved on, so allowing its rescue.
No photoshop trickery or anything. I simply found I had taken two shots about 15 months apart from exactly the same spot. The cairn/ skyline profiles match pretty perfectly. I'd love to say I'd planned it... but I didn't! Pure serendipity!
I hope they're right, because the ancient Irish have a lot to live up to already, and if it's proved that, say, the ancient Palestinians got there first, well I don't know how us modern ones will cope.