In reply to harrison:
The building is an old limekiln which I think has been recently exhumed from the brambles. The quarry entrance is a few yards down the road (south), as others have said the bolts give it away. However it's really pretty grotty and overgrown, not been revisited and given an overhaul like Wyndcliff Quarry.
if you follow the line of the crag north and slightly uphill there's a few more loose, overgrown buttresses and even further up a sort of little rift feature where a landslip has occurred. Quite an interesting area geologically but from a climbers point of view far less so.