Friend of mine found a nest on this route yesterday, so best avoid it. We didn't have anything to put a sign to let people know. Perhaps anyone going to shorn cliff could put something under he route or the Crag moderator could pop over? (It's a bit far to pop over for me
)
http://www.ukclimbing.com/logbook/c.php?i=37492
There seemed to be something nested behind the dead tree, described in the guide. I didn't investigate too long.