In reply to B_Mark_W:
The weather may be dry, but that doesn't mean the rock will be. Being East facing it gets neither much sun or wind at this time of year. It tends to stay green for a while after rain in Autumn & Winter. Also, it's that kind of fine grained grit that can be a bit fragile when wet.
Take a look by all means, you'll probably find a few dry lines but I wouldn't expect great things. If it's a no go you can always decamp to Hen Cloud or The Roaches which will be in the sun and wind.