Having worked in the industry I have never heard of any of the above. The above may be in the 5% VAT that you pay, but not in the cost of the energy? Not sure where you got the above information.
The standing charge pays for the distribution network maintenance, meter reader, meter operator, data collector, data aggregator etc all related to the supply of power.
The 13%, the extra slice of the pie included here, is I suggest simply a "hidden tax".
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