In reply to Kim:
They were from mid crag rightwards ie towards Curbar gap. Above Avalanche wall, PMC1, Eliminates wall etc. Mainly on top, or just below top, of crag. Initially m&f then another male turned up for a short while. I got the impression the original m&f were def a pair. Have they nested there before? I noticed a short section of crag has been sectioned off with a low wooden fence. Could be erosion control but seemed too small an area. Looked like it was protecting the top of the crag.