We’ve had mostly floating exchange rates for fifty years. You’d think by now people would report using the correct currency
Spending only happens if there was something to buy. If that spending is then deficit spending it has a lower inflationary impact than spending that is tax-matched.
There is no risk that interest rates on UK government debt will reach crippling levels. Interest rates are policy variables. Paying interest is a political choice. Betteridge’s law of headlines applies.