OP, on a point of principle you may not make formal reps until a NTO has been served on you by name.
As regards your argument:
however, I am currently appealing this PCN on the basis of inconsistent signage. At Branksome Chime, there are, I believe, four EV parking bays, however, only 3 of these bays are clearly marked on the ground with the 'blue background white car with charging lead' symbol. As you can guess, I inadvertently parked in Bay 4, where such ground markings do not exist, hence the lack of consistency IMHO.
This is a car park. There is no ''blue background white car with charging lead' symbol. There are no symbols or signs which are prescribed for use off-street. In order to know the rules of the car park we need to see.....the rules of the car park as specified on a noticeboard or similar displayed prominently in the car park.
Photos and GSV pl.