You are? well you can get yourself a job writing case summaries to send to the parking tribunal on behalf of Barnet Council as you will fit right in. All of the above errors came form one 3 page case summary.
The errors won't lead to the PVN (sic) being cancelled but there are some other procedural blunders in the case summary which will.
This is what happens when you contract out services (although it is never clear in parking if an NSL or a direct employee has written a particular item) as the contractor saves money by employing cheaper people than the council did hitherto. Cheaper isn't usually better.