...and another rock slide in the background. Also, just on the left in the wall at the back there may be a bricked-up opening; a geological field trip guide I found says:
In the back wall is a bricked-up adit, presumably representing the entrance to a former iron ore or lead mine.
I may have to go back and take another snap of that.
GPS Coordinates:
51.45642, -2.62507
Location: Clifton Down