In reply to TonyB:
It's unlikely to be steeply overhanging - barring any accidents with experimental super-rays in the next couple of weeks I'm not looking at much harder than 6a or thereabouts.
Is there a reason to prefer abseiling over lowering on double ropes or on one of a pair of halves, apart from preserving the lower-off? And is there a consensus on leading on half ropes as halves vs leading on half ropes as twins?
Cheers!