In reply to dan m:
False floors? Oh dear. That sounds poor. The one person I've spoken to who's done it said it was like being in Tomb Raider.
I think we're going to take full caving srt rigs + some climbing kit for anything that's going to be shockloaded.
One better way might be to have two parties, one going from each side - then any old fixed lines could be re-rigged. I hate trusting old fixed ropes.
Think you did the right thing with only one headtorch as it can take upto 8 hours. I've been stuck in a cave once under Symonds Yat when our torch went out and it was really unpleasant.