Britain’s economic debate rests on a dangerous assumption. Debt crises are things that happen elsewhere. Greece, perhaps. Argentina, certainly. But not the United Kingdom – a mature economy with its own currency, deep capital markets and centuries of institutional credibility.
History offers little comfort to countries that think this way.
Countries rarely enter fiscal crisis by accident. They do so after convincing themselves the usual constraints no longer apply. Britain issues debt in its own currency, a strength that greatly reduces the risk of outright default. But monetary sovereignty does not eliminate fiscal limits; it merely changes how they manifest. Governments that cannot credibly default often allow inflation to erode the real value of their debts. Less visible, but economically it delivers the same result, a transfer from savers to the state.
Britain is not in crisis today. But it is running a growth model increasingly incompatible with long-term solvency.
Government debt sits near 95% of GDP – a ratio once associated with wartime finance rather than the normal business of peacetime government. By advanced economy standards, Britain has moved decisively into the upper tier of indebted nations, above the OECD average and broadly comparable to France while far exceeding countries such as Germany. It remains below the extremes of the United States, but with growth persistently weak, that comparison should offer little comfort.
Debt is manageable when economies grow quickly. It becomes far harder to sustain when they do not.
Debt interest is now among the fastest-growing areas of public spending, and borrowing remains structurally high despite retreating from pandemic peaks. Britain is entering a more expensive financial era without having first repaired its fiscal foundations. For much of the 2010s, ultra-low interest rates masked these risks. That era has ended.
Today’s decision to hold rates serves as a reminder that the era of cheap money is over, and Britain’s fiscal room for error is narrowing.
Capital is no longer abundant, and investors have rediscovered their willingness to distinguish between sovereign borrowers.
Gilt markets are signalling neither panic nor comfort. Britain is increasingly required to pay a premium relative to comparable economies – a subtle but consequential shift.
Markets rarely panic without first repricing risk.
When the interest rate on government debt approaches, or exceeds, nominal growth, stabilising the debt burden requires sustained primary surpluses. Put simply, governments must raise more in tax than they spend before servicing their obligations.
There is little political appetite for such discipline.
This would matter less if growth were stronger. It is not. Britain has endured nearly two decades of weak productivity, subdued investment and disappointing expansion, while attempting to sustain a large and steadily expanding state atop a slow-growing economy.
High debt is survivable. High debt without growth is not.
The defining economic failure of modern Britain is therefore not simply the size of the state but its declining capacity. Taxes are at post-war highs, yet the country struggles to build housing, deliver infrastructure on time or budget, or execute major projects with anything resembling urgency.
For more than a decade, politicians of all parties have sidestepped the hardest economic choices, preferring fiscal illusion to fiscal repair while leaning on optimistic forecasts, revising fiscal rules when convenient and postponing structural reform.
Markets are patient – but never indefinitely so.
The greater danger is not a sudden crisis but a slow fiscal squeeze, as rising debt interest crowds out productive spending, pushes the tax burden higher and locks the economy into a low-growth equilibrium. Fiscal pressure rarely announces itself loudly. It builds quietly – until it cannot be ignored.
Countries that fail to control their debt eventually surrender economic sovereignty. Fiscal choices narrow when borrowing costs are shaped more by investor tolerance than by domestic policy. The illusion of control can persist for years – until markets abruptly withdraw it.
Whoever governs Britain after the next election will inherit the same immovable constraint. Without materially stronger trend growth, the fiscal sums will not add up. There is no credible path to debt sustainability that does not run through a faster-expanding economy.
That demands reform on a scale Britain has spent years discussing but repeatedly postponing.
Planning must come first. Britain needs the most serious liberalisation of its planning system in a generation, moving from a discretionary regime that empowers veto to a rules-based framework that enables building. Clearer national guidance, expanded zoning and firmer limits on judicial obstruction would unlock private capital currently deterred by uncertainty.
For an advanced economy, Britain has become remarkably bad at building things.
The problem is not a shortage of capital. It is a shortage of state capacity.
Infrastructure must follow the same logic. Projects that take a decade to reach construction do little to raise productive capacity. Approval timelines should operate closer to commercial reality, with a strong presumption in favour of nationally significant infrastructure.
If Britain cannot build quickly, it cannot grow quickly.
Serious reform of the tax system is also long overdue. The structure too frequently works against investment rather than to support it, and the burden is already heavy. A more straightforward and predictable framework, along with a clear reluctance to raise marginal rates further, would show that Britain wants to compete for those that drive growth rather than push them overseas.
But growth reform alone will not suffice. Britain does not have a revenue problem so much as a spending trajectory that no mature economy can ignore indefinitely. Ministers must confront the relentless rise of public spending before it crowds out the state’s capacity to invest.
The pressures are well known – particularly in health, pensions and welfare – yet meaningful reform remains politically deferred. Sustainable public finances ultimately require choices governments have so far preferred to postpone.
None of this should be party political. It is the minimum required for fiscal sustainability. For now, markets are giving the UK the benefit of that doubt. The window for reform remains open – but history suggests such windows rarely remain open for long.
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