it is the economic foundation of the UK that London and the South East are the only net contributors to our economy, and the surplus is redistributed everywhere else.
This is not how money is dispersed in an economy.
Any country with its own sovereign currency and central bank (like UK, US, Japan, India, Australia etc) has an almost unlimited supply of money at its disposal. Money is an infinite commodity. It is mere numbers in the electronic spreadsheets of banks. You cannot run out of money in the same way that you cannot run out of numbers.
There are real constraints of course in terms of actual physical resources - the real economy which underpins the financial one.
The UK government can create any amount of money it requires on demand and spend it into the economy as has been demonstrated by nearly every country in the world during the pandemic in terms of various financial schemes to keep people employed or to be able to access basic necessities.
You do need to use taxation as a form of 'drainage' to remove excess money in circulation so as to avoid inflation. But government spending always comes first and then taxation. Not taxation first and then government spending.
This is a very good resource that explains the concepts clearly.
modernmoneybasics.com/
It's written from a US perspective but applies equally to the UK because of the similar mechanisms used.
If certain areas of the UK are chronically underfunded, this is because of lack of political will rather than a lack of funding by the UK government.
Nations like Scotland or local authorities do not have a central bank and therefore cannot create or issue money. They are dependent on budget allocations from the UK government. They can also supplement their budgets by various local taxes and fines. So in this way, yes they do need taxation first before being able to spend money, but they might resort to other mechanisms like borrowing.
If Scotland is able to allocate funding from its finite budget for period products, free prescriptions etc, then the UK government has zero excuse given it has a virtually unlimited supply of money at its disposal. It is a deliberate choice by those in government not to.