In reply to tenbob: Nah the big cave with the bolts well left of the trad routes at Harbour Wall and it was only the lefthand two that were dry tooled I thought. There are 5 bolted lines, the lefthand two are the dry toolers than a F6b+, F7c and finally a F7b.
In response to Lamb's original question the perfect venue is the vast amphitheatre area of rock at the righthand side of Johnsheugh. Right of the trad routes. Another place with potential is the vast cave at Findon Ness right of Grave Doubts. You will need a drill, bolts and a vast amount of energy but go for it. My other top tip would be the right wall of Boglesheugh ie the east facing wall, big and scary but some solid rock in there for the bolts.