In reply to Flinticus:
> Anyone boulder there? What's it like? Worth a trip from Glasgow?
I haven't noticed any boulderers' chalk. It's a great venue for well-protected E1- crack climbing; I would guess less attractive for bouldering. Popular/starred routes are generally safe, though some crimp holds (and stacked blocks) are not beyond reproach. Routes that get less traffic, well... that may be for a reason. I have seen a ledge collapse in Thorntons Quarry, and guidebooks refer to historical rockfall in Forth Quarry.
> Is it clean / safe for a dog to run around or covered in broken glass and ned party litter?
Personally I'm not a fan of unsupervised dogs while climbing, for all sorts of reasons, but I'd suggest it's not a great place for a dog off the lead anyway. Some broken glass, masses of sticky burrs you will be combing out for weeks, and mtb/motorbike jumps often in use in the middle of the quarry.
> Alternatively, and I appreciate its not bouldering, what length rope for top roping?
Routes are probably about 15m high. Bring rigging ropes and edge protection, as anchors are generally stakes/fenceposts/trees about 5m back from the edge.
Lovely place on a summer evening, as long as there's a breeze to keep the midges off. Some of the best E1- cragging I know of, second only to Trowbarrow. Mostly dries pretty fast.
Post edited at 12:10