So, let's try to summarise your thread. Tell us if it's right or correct me.
You parked somewhere along Great Ostry in a service yard in a space reserved for permit holders. You spotted a CEO approaching, so dived into your car and drove off quickly thinking that was the end of the matter. This is what is called a "driveaway", and was common before the Traffic Management Act 2004 put in a specific provision to cater for their enforcement namely the parking contravention before the driveaway took place. The Act permits a postal PCN to be served when the CEO had started to prepare a PCN but was unable to serve it to car or driver because the driver drove off before it could be served. In the normal course of events, you would have received a postal PCN.
However, your circumstances add to your difficulties, because it would seem your V5C Registration Certificate was not up-to-date regarding the address. The council can obtain the name and address of the keeper of a vehicle alleged to be in contravention on request to the DVLA. Subsequent to this, they send all of the statutory enforcement documents to that name and address, unless the intended recipient advises them of a new address. When nothing comes back, they eventually register the PCN at the Traffic Enforcement Centre, and send out a final statutory document, the Order for Recovery, which adds £10 to the amount of the Charge Certificate, this being the TEC registration fee. If no response is received to this OfR, the council can and invariably will, instruct bailiffs to collect the money. Bailiffs are very good at tracking people down because their livelihood depends on it. It seems you are not at this stage yet.
The council havve also sent out a final reminder letter, which is not a statutory document, but it does correctly describe what will happen if payment of the CC amount is not made.
Looking at the dates of your last V5C update, (17th July) and the date of the PCN (30th June), there is not a huge gap, so if the PCN went to the previous V5C address, why did you update it on 17th July, when clearly you had moved some time before ?
It's important in these matters, to get all of one's ducks in a row, because the next stage of the process, the council registering the debt at TEC does not yet seem to have taken place. It is therefore very important that you find out if the PCN has been registered, because once it has, you only have 21 days to submit an in-time Witness Statement that the PCN was not received. No reason is necessary for an in-time submission. However, if you miss this deadline, you would have to submit an out-of-time statement, which can be opposed by the council who will no doubt have instructed bailiffs by then.
Of course you can achieve quick closure by just paying the Charge Certificate amount, but I suspect you would rather not.
So, please tell us a bit more about your V5C update. At the moment you have to concentrate on getting the process reset back to the PCN stage because at the moment the period for submitting representations is past.