Thanks, Sacha.

Ben, what's your alternative solution?

There's this reference in Spark NZ (The Telco Formerly Known As Telecom)'s T&C;

"The Operator and Spark Digital reserve the right to disclose end user information that it believes, in good faith, is appropriate or necessary to take precautions against liability; to protect the Operator and Spark Digital and others from fraudulent, abusive, predatory, or unlawful uses or activity; to investigate and defend against any third party claims or allegations; TO ASSIST GOVERNMENT ENFORCEMENT AGENCIES; or to protect the security or integrity of the Platform."

Also more I've written on the subject (which may or may not be useful - especially the bit about the National Cyber Policy Office (NCPO) and something called "Connect Smart".

http://thedailyblog.co.nz/2015/10/04/the-mendacity-of-ms-una-jagose-spymaster