Thankyou for your response.
I must say that I find some of your statements surprising in the extreme.
A few months ago I obtained withdrawal of a PCN issued against me for being stuck in a yellow box - I succeeded because, following a particular website's advice, I argued that the PCN had been improperly formulated.
And yet here, you seem to be arguing that it doesn't matter if a legal document such as a PCN has been improperly formulated.
You seem to think that not formulating "restricted hours" in a legal "charge" sheet such as a PCN "is not a procedurally improper issue".
I think you are completely wrong on this fundamental issue.
Still, now with great reluctance, I shall have to get our son to pay the initial reduced fine of £65.
I really don't understand how you can take the stand you do and "allow" such imprecision in a legal document to go forward. I think you are completely wrong.