In reply to arvinw:
We did it last week and downclimbed the top bit to the fixed ropes than downclimbed the rest of the ropes in succession with a prussic as a back-up. Some people were abseiling but it look like a big faff given there are limited anchors around, the number of people on the pitch at any given time and the possibility of getting tangled up in the fixed ropes. It should be relatively obvious what the best method is given the conditions when you get there. Try to avoid descending this section when it is busy, as it can descend into a bit of a mess, although easier said than done.