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It just does not. I am not dismissing you or belittle your post. I am all ears and would like to understand more. I would have though somewhere in BS7671 it would say something like to earthing systems cannot be in one location. Guess guess guess. Not fact!!!!
don't get many swimming pools on the railways although the unions are thinking about this 'right' in there current talks.
You aren't mixing earthing systems.
A PME supply has an earth rod connected at regular intervals from the substation right up to the end of the cable run. All you are doing is adding another electrode which is connected at the MET of the installation. The big danger with PME is when the neutral becomes broken between your installation and the DNOs earth rods, having your own rod connected to your installation mitigates the danger in your installation.