growstuff
I can understand why Maizie feels she's bashing her head against a brick wall and becomes frustrated.
Thanks, growstuff 
Petera says Don’t take this as an invitation to write a thesis, which I appreciate, but without the backing of academic analysis of the mechanisms of state funding I don't see how one can get at the truth of how the process works.
I use Murphy's blogs because he a good communicator and explains things clearly, but he is just clarifying the research of academic economists.
So here I am using an academic paper called The self-financing state: An institutional analysis of government expenditure, revenue collection and debt issuance operations in the United Kingdom
The authors say This paper constitutes a first detailed institutional analysis of the UK Government’s expenditure, revenue collection and debt issuance processes. We find, first, that the UK Government creates new money and purchasing power when it undertakes expenditure, rather than spending being financed by taxation from, or debt issuance to, the private sector.
It all centres on the Consolidated Fund, which was set up in in 1787 as ‘…one fund into which shall flow every stream of public revenue and from which shall come the supply (i.e the money) for every service’ (HM Treasury 2021).
This could be looked on as the Government’s account at the Bank of England
The authors explain it:
We find, first, that the UK Government creates new money and purchasing power when it undertakes expenditure, rather than spending being financed by taxation from, or debt issuance to, the private sector. The spending process is initiated by the government drawing on a sovereign line of credit from the core legal and accounting structure known as the Consolidated Fund (CF). Under directions from the UK finance ministry, the Bank of England debits the CF’s account at the Bank and credits other accounts at the Bank held by government entities; a practice mandated in law. This creates new public deposits which are used to settle spending by government departments into the economy via the commercial banking sector. Parliament, rather than the Treasury or central bank, is the sole authority under which expenditures from the Consolidated Fund arise. Revenue collection, including taxation, involves the reverse process, crediting the CF’s account at the Bank.
The creation of new money in the CF is just a the same as the commercial banks' creation of new money when they make a loan to a customer (bank lending isn’t financed from deposits, it’s completely ‘new’ money)
As the CF also handles the revenue from taxation, and other sources, it can be seen as tax revenue paying off the government ‘overdraft. But it isn’t necessary for the tax revenue to be in the CF before the government can spend any money.
I don’t know how this can be made any clearer. The paper, though technical, is quite readable. It looks at different explanations of government funding and it details the authorities consulted in the course of the research.
But just reading the Abstract and the Conclusion is helpful to understanding
www.ucl.ac.uk/bartlett/public-purpose/sites/bartlett_public_purpose/files/the_self-financing_state_an_institutional_analysis_of_government_expenditure_revenue_collection_and_debt_issuance_operations_in_the_united_kingdom.pdf