In reply to ewanjp:
If there have been a few consecutive dry days you'll probably find plenty of climbable rock. Most areas won't get much sun at this time of year ...the slabs with Balch's Slide will probably be the exception.
Even in the height of Summer it is a moot point as to whether Fairy Cave is grim or not!
I assume you are aware of the access arrangements (detailed on the UKC crag page and the mini Fairy Cave guidebook). Enjoy it if you do go for it.