when i got to the yard this afternoon, M was in....as were all the geldings, it transpired. the field fence is down at the bottom of the hill. the estate workers had all gone home, of course (if they were even in, who knows) and no one had been able to get hold of YM at that point.
and M was still covered in very wet soggy mud - all up the side of his neck etc. apparently the last thing he did before being brought in was roll!
so i fed him, put more haylage up, and came away again...