In reply to tehmarks:
Allthough this doesn't help at all, and hopefully a local will know...
I was in exactly the same position a few years ago with pillar front, and posted on here, unfortunately dispite its quality Eastby seems a quite moderately infrequented crag and the general consensus was "go and have a look" whitch I did, its pretty roadside, i couldn't spot any birds and cracked on. Crookrise is just around the corner so it's not like it will be a wasted trip if a nest is there.