No doubt PPRuNers have before been informed that in a cloud in uncontrolled airspace in the Uk it is perfectly legal to fly your glider, provided that you are wearing a parachute, and if entering cloud near a gliding club, announce your intention on the cloud flying frequency, and begin your climb from the base of the cloud.
It is also useful to have sensible cloud flying instruments, and these days FLARM would also be sensible.
No use asking controllers to separate gliders, presented with the equivalent of a swarm of gnats on the screen.
If New Zealand is so very tightly regulated, do they permit gliders to fly in cloud? Perhaps I shall pose this question on the antipodean forum!