In reply to Southern Man:
I live in NZ, and have traveled all over the world with my ropes and returned to NZ. There's not a "rope" box to tick on your customs form, and they seem primarily concerned with boots and tents - and that's it. They would obviously see my ropes on the xray machine, but nobody's ever mentioned anything. I'd make sure your boots and tent are well scrubbed (if they're not, it's not a big deal - they'll scrub them for you).
Don't worry about it.