I don't think this is the first time I have mentioned to you how absurd this idea of yours is that sovereign debt should be repaid. This is such an easy thing to understand I don't know why it can't sink in with you. I'll explain it very simply. But before I launch into a more detailed explanation, but nevertheless still quite simple, let me state what I think is a key defect in your arguments. You are apparently not recognizing that as productivity grows the amount of money in the economy must grow with it to prevent deflation and to maintain a constant value of the currency. That requires that the government spend more into the economy than it taxes back out, i.e., deficit spending is a requirement under such a circumstance!
The government spends money into its economy and taxes it back out. To maintain a constant value of the currency, as long as population and productivity grow, the amount of money in the economy must grow as well. The debt, when it is matched to deficits, is equal to the money created and spent into the economy minus the amount taxed back out. If more money is needed in the economy the government must spend more into the economy than it taxes back out, and vice versa.
Because in the U.K. and in the U.S. both population and productivity have grown over the years, these governments must run a net deficit to maintain a constant value of the currency. No country with its own fiat money must borrow to be able to spend in excess of its revenue. For these countries bonds serve a different purpose than the raising of money. The issuance of bonds only appears to be a means of the government raising money.
The bonds issued by countries with their own currencies
don't have to be paid off, but they
do have to be serviced. As the servicing of debt is just like any other spending into the economy, the amount of debt servicing has to be included in the total of money spent into the economy (i.e., "outside money'). As debt servicing is
not discretionary, whereas some other types of sovereign spending
are discretionary, the total amount of debt servicing has to be paid attention and not allowed to grow to the point that it impinges on other necessary, non-discretionary spending to the extent it would cause excessive inflation. It is possible that a government, via excessive spending, could find itself in a debt servicing crisis where it would be forced to pay off some of its debt. That's why excessive deficits over time could lead to trouble. But in general a Nation that runs its economy well, will never have to pay off its debt, and certainly never all its debt. For countries that target a small positive inflation, the real debt is constantly being reduced via inflation and this acts as a counter to growing debt servicing.
The government can only pay off bonds issued in
excess of what is warranted by population and productivity growth, plus any built in positive inflation target, without causing deflation. Any significant deflation in an economy that runs on credit is ruinous.