Free Traffic Legal Advice

You need to make your Google Drive links "public". At the moment they are 'Private@ so cannot be opened.

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from one delivery point to the next the satnav’s route was through this road.

It's fatal to rely solely on satnav in big cities especially London. They are never up-to-date. Here there are two clear signs with no times or days so apply 24x7.

HOwever, the most important point to make is that the PCN is not addressed to you, but to the Royal Mail.The law on decriminalised traffice enforcement like this, is that the owner of the vehicle has responsibility for paying or appealing PCNs, not the driver. So the question is, how did you receive this PCN ? You need to find out what the conditions of service are related to traffic and parking PCNs. Such is the law, that you cannot submit representations unless authorised by Royal Mail. Of course you can pay it !!

So, you need to get info from Royal Mail on what their arrangements are for PCN appeals and payments. Post here when you know.

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When I mentioned appealing first before paying he said "it's all yours you can do whatever you like".

Except you cannot do what you like at all, as the law is quite clear; only the registered keeper can appeal.Only if you get a letter of authority from Royal Mail can you appeal the matter. So essentially your cojones are in a rat trap.