In reply to oly-l:
Hi Oly,
I checked out the quarry yesterday, good find! Well done in doing all that cleaning.
I agree with you that with the exception of two obvious lines the rock affords little protection and so is suitable for bolting.
What I would say though that I think you undersell it a little in that I reckon you could get a some decent sports routes on the main wall, probably in the f6s and f7s. If so it would make an excellent venue for Summer evenings.
Re the other quarries around there, I did a lot of cleaning of the one on Costorphine hill that houses the bunker. The back and right hand side walls are suitable for rock climbing and have been climbed on but the left wall is pretty messy; possibly a low grade DT venue though. The big quarry beside it which is used by the council doesn't have any decent climbing in it. Don't know about the one by the pool in Ravelston park.