Did you seak legal advice to confirm that?

I too was under the impression (unless it has changed recently) that if it was a fixed / mobile camera that they needed to send out the NIP documentation within 14 days (if it doesn't get to you for various reasons after that point, that is immaterial, it is the fact they have to send it within that time frame - this is so that you can be reasonably expected to be able to name the driver). Obviously if you were stopped and cautioned / advised at the time, then this is the same thing as receiving an NIP - you're just given it on the spot. And then they have to prosecute within a 6 month time frame. However, if you were involved in an RTA, this increases to 12 months.