Crag-fast sheep?

When we parked the car for a short walk at Rannerdale I was very taken with the sight of this sheep happily grazing on a rocky ledge. However it was still there after our short walk and we did wonder if it might be crag-fast...they do sometimes walk along a ledge and then have trouble turning round to head back.
We were not in the running for any sheep-saving medals (especially if it was actually fine) but we did leave a note on the windscreen of the 4x4 at the near-by farm.