There is a well documented loose block on the Hangover at Causey Quarry:
http://www.ukclimbing.com/logbook/c.php?i=47942
I was looking at this today and it only needs a swift kick for it to be removed. I guess that'll change the grade of the climb but I can't see anyone using it as part of the route now anyway. It would be a very brave person to stand/climb beneath it as it hangs now to be honest.
What is the best thing to do in this situation? I'm happy to remove the block next time I am there but don't want to upset anyone. I think it's pretty clear that no one will be using it as a hold and I'm sure many are avoiding the whole climb until it has fallen.
There are also a lot of kids/families/drunks who play around at the bottom of the quarry as it is on a public footpath to the tourist attraction of Causey Arch. I'd hate for it to fall on one of them.
It'll change the route a bit, but it will also open it back up to be climbed and make it safer for everyone.