All very well , but if more than 14 days has elapsed since the alleged offence , which it has , since this thread started on May 22 , then it is too late to issue the NIP , so the prosecution must fail .
If it was taken by an automatic camera or scamera partnership I believe you are correct. But this is an investigation into someone filming themselves breaking multiple laws to all intents and purposes, not just speeding. I would think it would be a much more complex case, unlikely to have many precedents to follow. Conviction and cost/benefit will of course be difficult/high, but I would guess the CPO in this case believes its in the public interest to try for a conviction by way of setting an example to stop others doing it.
You will be caught was his message, and it would appear he is indeed following through with that.