The rock is no softer than any of the other Northumberland Crags, but there are some very fragile flutings, notably on Eastern Arete, which would be fine for experienced leaders to lead and novices to second though.
It's a lovely spot and fairly suited to beginners, but unless you can find a farmer to ask permission, I would have a backup plan. We tried to find someone at the farmhouse at the end of the road, but you will likely have more joy at the cottages on the right. Also there may be stuff going on on the farm that would stop you being able to get to the farm. wellies or hiking boots may be a good idea as part of the approach is through farm buildings where they may be a fair bit of "muck" about