I got the news just before lunch so headed out to look for myself. I immediately located it, exactly as described ....
Showing, but not well
Barn Owls are such graceful and superb birds to watch, it makes seeing one in this state all the more saddening.
From the position and posture of the corpse, it seems almost certain that it has collided with either the barbed wire loosely wrapped around the fence or perhaps the electrified single-wire running about 1m behind to keep cattle in during the summer (though whether it is live at the moment I wouldn't know). The bird is unringed, and I can't be sure but I suspect it is a male as the underparts are a very clean white with few dark flecks. I have picked it up and brought it home with the intention of sending it to the PBMS.
Evening visits to the lane over the next week or so will hopefully identify whether this unfortunate individual was a recent solo arrival to the area, or part of a pair.