Firstly, if you believe it’s a real good idea, make sure you've got it copywritten, so no one can be accused of steeling your great idea. Then send it in to:
The Programme Manager
C4 Television
Private Bag 92624
Symonds Street
Auckland.
Make sure you have an e-mail contact and then wait for a response. Don't be too upset if your idea doesn't go any further, there are only so many things we can do.