In reply to Oogachooga: As you go out from the car park, turn right to walk along the wall. Follow the wall until you reach the tree line. Either go through the trees and turn left about halfway down the valley slope, or follow the path above the trees round to the left, for a few hundred yards, before going down a small track to your right. The outcrops are on the east side of the valley (the car park side).
It's a bit tricky to find, but the walk through the wood isn't unpleasant.