Not everything is about GDP. You belittle farming, but without food to eat, Londoners would not be generating a lot of economic output at all.
The original point here was that London generates disproportionate tax revenues, but only because it is home to more scalable service industries and relies on the less lucrative but essential supplies and infrastructure from elsewhere.
What other natural resources are being "harvested" to enrich London so much?
Almost none of the UK's electricity supply originates within London, even if we take that to mean Greater London.
London also has no major sources for fuels.
Your whole thesis is laughable. You seem to be upset
Why would I be upset about anything? I only commented that London is able to generate disproportionate tax returns because it's service-based and relies on the rest of the UK for support. That's not a "thesis", it's a simple economic fact, and everything I've mentioned in support it of is readily verifiable for the price of a Google search.