I emailed the rangers about removing loose rock with tools... don't think there can be any complaints as it makes the place a lot safer for climbers, and the local schools which abseil there (thought that was a good card to play... it is true though). 'defining' the holds is actually removing the rock with consistancy of weetabix from good rock with the potential to be a hold. I mentioned bolting but only as something to discuss in the future, as there's abseil points at the moment (trees). I dont see there being any problem with bolting as blackford hill has bolts at the top of routes and thats on land managed by the local rangers as well. I directed them to the mcofs participation statement so they should know that they're not liable for climbers if the quarry becomes bolted.
http://www.mcofs.org.uk/climbing-participation-statement.asp
As for the state of the quarry, your right, its a bit of a grim place, it's much better than it has been in the past as the matresses and most of the rubbish has been removed. never been any junkie needles there, its not really that kind of area, more school kids leaving glass bottles. it wont be hard to clean it up a bit.
The fact that its not an asthetically pleasing place, with no scope for any good rock climbing, makes it perfect for a drytooling venue. we just wanted somewhere to get time hanging from our axes without having to drive for hours / wait for good conditions.
I'll post what the rangers say when they get back to me.