The trilateral security pact known as AUKUS has issued a stark directive: US, Britain and Australia must not retreat from Asia, and defence budgets must rise. This is not a request. It is a command from the geopolitical reality that the Indo-Pacific is now the world’s economic and military fulcrum.
For the City of London, this translates into a simple equation: more borrowing, higher gilt issuance, and a further squeeze on fiscal headroom. The Chancellor, already grappling with slow growth and stubborn inflation, must now find billions for naval infrastructure and submarine contracts. The market will not be kind. Gilt yields are already pricing in a risk premium for a government that seems to spend without limit.
Let us be clear: defence spending is a necessary burden, but it is a burden nonetheless. Every pound diverted to the Clyde or to Barrow-in-Furness is a pound not spent on hospitals, roads or tax cuts. The Treasury will have to choose between fiscal discipline and strategic commitment. History suggests they will choose the latter, because the alternative – a strategic vacuum in the Pacific – is a threat to global trade and therefore to the UK's economic survival.
The bond vigilantes are watching. If the government finances this through yet more debt, the cost of borrowing will rise, choking the private sector. If they raise taxes, they kill the growth that generates revenue. The only sensible path is to cut waste elsewhere. But Whitehall has never met a quango it didn't like, so I am not holding my breath.
The market volatility will increase. Sterling will feel the pressure. Capital flight will be a risk if investors sense that the government's commitments are unfunded. The central bank may be forced to hold rates higher for longer, further dampening economic activity.
In short, this is a classic defence-spending dilemma: you cannot afford not to do it, but doing it will cost more than you think. The allies have vowed no retreat. The markets will demand to see the bill.
