“The threat of rising interest rates is a Greek tragedy we must avoid.” This was the title of a 2009 Daily Telegraph piece by George Osborne, pushing massive spending cuts as the only solution to a coming debt crisis. It’s tempting to believe anyone who still makes it is either deliberately disingenuous, or hasn’t been paying attention.

The line of reasoning goes as follows: Britain’s high and rising public debt causes investors to take fright and sell government bonds because the UK might default on those bonds.

Interest rates then spike up because as less people want to hold UK debt, the government has to pay them more for the privilege, so that the cost of borrowing becomes more expensive and things become very, very bad for everyone.

This argument didn’t make sense back in 2009, and certainly doesn’t make sense now. Ultimately this whole Britain-as-Greece argument is disturbing because it makes the austerity project of the last three years look deeply duplicitous.

If you go to any bond desk in the City that trades British sovereign debt, money managers care about one thing – what the Bank of England does or doesn’t do. If Governor Mark Carney says interest rates should fall and looks like he believes it, they fall. End of story.

Matt Brown

Why? Because the Bank directly controls the interest rate on short-term government debt, so it can vary it at will in line with any given objective. Interest rates on long-term government debt are governed by what markets expect to happen to short term rates, and so are subject to essentially the same considerations.

It doesn’t matter if investors get scared and dump government bonds because this has no implication for interest rates – it is what the Bank of England wants to happen that counts.

If investors do suddenly decide to flee en masse, the Bank can simply use its various tools to bring interest rates back into line.

The simple point is that since countries like the UK have a free-floating currency, the Bank of England doesn’t have to vary interest rates to keep the exchange rate stable. Therefore it, as an independent central bank, can prevent a debt crisis by controlling the cost of government borrowing directly. Investors understand this, and so don’t flee British government debt in the first place.

Greece and the other troubled Eurozone countries are in a totally different situation. They don’t have their own currency, and have a single central bank, the ECB, which tries to juggle the needs of 17 different member states. This is a central bank dominated by Germany, which apparently isn’t bothered by letting the interest rates of other nations spiral out of control. Investors, knowing this, made it happen during the financial crisis.

On these grounds, the case of Britain and those of the Eurozone countries are not remotely comparable – and basic intuition suggests steep interest rate rises are only possible in the latter.

Britain was never going to enter a sovereign debt crisis. It has everything to do with an independent central bank, and nothing to do with the size of government debt. How well does this explanation stand up given the events of the last few years? Almost perfectly. The US, Japan and the UK are the three major economies with supposed debt troubles not in the Eurozone.

The UK released a plan in 2010 to cut back a lot of spending and raise a little bit of tax money. The US did nothing meaningful about its debt until 2012, and has spent much of the time before and since pretending to be about to default on its bonds. Japan’s debt patterns are, to put it bluntly, screwed – Japan’s debt passed 200 per cent of GDP earlier this year and is rising fast.

But the data shows that none of this matters for interest rates whatsoever. Rates have been low, stable and near-identical in all three countries regardless of whatever their political leaders’ actions.These countries have had vastly different responses to their debt, and markets don’t care at all.

By the same token, the problems of spiking interest rates inside the Eurozone have nothing to do with the prudence or spending of the governments in charge.

Spain and Ireland both had debt of less than 50 per cent of GDP before the crisis and were still punished by markets. France and the holier-than-thou Germany had far higher debt in 2007, and are fine.

The takeaway is that problems with spiking interest rates amongst advanced countries are entirely restricted to the Eurozone, where there is a single central bank, and have no obvious relation to the state of public finances.

So what we have, then, is a disturbingly mendacious line of reasoning . Back in 2010 the Conservative party made a perhaps superficially plausible argument about national debt that was wrong then and is doubly wrong now. They then – sort of – won a mandate to govern based on this, and used it to radically alter the size of the state. The likelihood that somehow this was all done in good faith beggars belief.

Britain has had a far higher proportion of austerity in the form of spending cuts than tax rises relative to any comparator nation. On this basis austerity is a way of reshaping the state in the Conservative image, flying under the false flag of debt crisis-prevention.

If the British public had knowingly and willingly voted for the major changes made under the coalition in how the government taxes, spends and borrows, this wouldn’t be such a great problem.

Instead, they were essentially conned into it by the ridiculous story of Britain as the next Greece.