Understood that the advice here is a) free and b) advice only. Happy to take a punt, if not for me then for other users.
The CAZ regulations allow for the adding of the PCN charge to the road user charge, that's not in doubt. But the mechanism for the PCN doesn't allow for adding the road user charge onto the PCN, presumably that would need another bit of regulation.
That's where the slimness and balance of probabilities of success lies for me - an appeal based on the strict wording of the PCN only allowed to mention the penalty charge ( Part 3, Reg 7, 7.3(f) ).
A draft along the lines of:
Reiterate the DART PCN decision 2018.
Accept that under regulation 2 part 4, the CAZ authority is entitled to specify whether the road user charge is to be levied in addition to the penalty charge, and the Bradford Clean Air Zones Charging Order article 12 states "A penalty charge will be payable, in addition to the charge imposed under article 7".
However the PCN received states that the road user charge is to be paid in addition to the penalty charge, whereas regulation Part 3, Regulation 7, 7.3(f) states that only the penalty be paid, and there is no regulation to demand both the penalty and initial road user charge, which are separate elements.
This amounts to a procedural impropriety and therefore the PCN should be cancelled.