In reply to TobyA: Agreed, but for those who want to have a go at Nesscliffe but maybe haven't yet got the confidence with protecting sandstone, Red Square is a good one to toprope as its a good climb at a good height and you can easily rig it so that your ropes don't cut into the rock.
Just sharing a bit of knowledge so we can all look after the crag and keep an eye out for each other.
And on that note: Nesscliffe can get really soft and greasy 2-3 days after rain as the rock is really porous. Good thing to know if you don't fancy getting too much air time and testing the gear you are putting in the wall.