Just to recap - it looks like the farmer has hoyed the stones up, cleared the land of vegetation and dumped the stones to the side.
I'm probably gonna pop back to Yorkshire for a couple of days soon, and did intend to have a look. I was never very sure that I'd found it in the first place, so may not be able to confirm anyway. Paul Bennett reckons it's gone and he'd probably know better than anyone... so there may not be much point. Have lots of other sites I want to check out... including a suspected stone avenue near the grubstones.