Am I missing something or is the yield rate really just effectively the market rate on bonds that the Eton cokeheads in the city are willing to buy? And if it goes too high the UK enters a debt price spiral that the incumbents will be blamed for? And somehow this isn’t seen as a national security issue, that it would take relatively little coercion in the bond market to destabilize the entire country?
I would actually just talk about conscripting the wealthy into purchasing mandatory low interest bonds, under threat of simply taxing them the equivalent value - and selling it as civic duty.