I've had to release a rope which got knotted from the top of some of the routes in the toilet sector and did so by reaching to the lower off from the top so I would imagine it would be fairly easy to set up a top rope.
In reply to h.cook2000:
Yes, lots in the main section, which is the tall wall on the right. Walk up from the right hand end. Use two of your own quick draws or a screw gate to avoid wear on the top chains