In reply to Removed User: Corbie's Crag is certainly in the old edition of SMC Lowland Outcrops, right next to Blackford Quarry. I'm pretty sure it's in the current edition too although I can't check right now 'coz mine is at home and I'm in the office.
I've not tried any of the routes but IIRC the book specifically mentioned the shortage of useful gear placements (is that what you meant by "bold"?) and the fact that many of the top-outs were through gorse bushes.