Andy Burnham is walking straight into a financial minefield. The newly elected MP for Makerfield is widely expected to take over as Prime Minister later this month, but the economic honeymoon is already over before it even started. The Office for Budget Responsibility just dropped its annual fiscal risks and sustainability report, and it reads like a horror story for anyone hoping for a major public spending spree.
The UK fiscal watchdog didn't mince words. They warned that Britain’s public finances are on an "unsustainable and ever-rising path" in almost all scenarios. If the incoming Labour leader wants to stop national debt from spiralling out of control, he needs to find an extra £100 billion a year. To put that in perspective, that's roughly equivalent to the entire annual education budget or the nation's total onshore corporation tax receipts.
The Myth of the Easy Growth Engine
Burnham's allies have spent months hinting that he wants to use massive public investment to kickstart growth across the country. It’s a nice idea in theory. In reality, the numbers don't add up. The UK is currently sitting in a remarkably weak position compared to its global peers.
Over the last two decades, the rise in British public debt as a share of GDP has been one of the steepest in the advanced world. Net debt has nearly tripled since 2005. The UK’s debt-to-GDP ratio now sits at roughly 95%, which is a staggering 45 percentage points higher than the average for advanced economies.
The biggest problem isn't just past economic shocks like the pandemic or inflation spikes. It’s structural. Britain has an ageing population, and the cost of keeping the country running is ballooning automatically.
- Healthcare: The OBR expects health spending to climb from 8% of GDP in 2030-31 to 13% by 2075-76.
- State Pensions: Spending on pensions is on track to jump from 5% of GDP to 9% over the same period.
- Social Care: Expected to see a similar upward trajectory, leaving education as the only major area where spending pressures might ease.
Basically, government spending excluding interest is on track to hit 49% of GDP by 2075-76, up from 40% at the start of the next decade. You can't simply grow your way out of a demographic shift that massive.
The Triple Lock Dilemma
During his campaign, Burnham committed to keeping the pension triple lock. It’s a popular political promise, but the OBR explicitly pointed out that the policy is a major driver of fiscal instability. The triple lock ensures pensions rise by average earnings, inflation, or 2.5%—whichever is highest.
According to the watchdog, dropping the triple lock and simply uprating pensions by average earnings would wipe out a full fifth of the projected long-term debt increase. Altering welfare spending to rise with inflation rather than average earnings would offer similar relief.
By locking himself into these popular spending commitments, Burnham is limiting his options. Bond markets are watching closely. Financial heavyweights are already warning that if the incoming administration signals a massive rise in borrowing to fund an expansive agenda, investors will react quickly. The memory of the 2022 mini-budget disaster still looms large over Westminster. If bond yields spike, the cost of servicing the existing debt will eat up whatever fiscal headroom is left.
Delaying the Pain Makes It Worse
The Treasury insists it has the right plan to deal with economic shocks, pointing to endorsements from the International Monetary Fund. But the OBR’s long-term projections suggest the current rules are only sticking plasters on a gaping wound.
If Burnham takes immediate action by 2030-31, stabilizing the debt at 95% of GDP requires a fiscal tightening of 3.8% of GDP. That means pushing through spending cuts or tax rises a third larger than the government currently plans over the next five years.
If he chooses to delay the hard choices until the 2050s, the required adjustment jumps to 8% of GDP. That would mean finding cuts equivalent to the entire NHS budget, passing a massive burden onto future generations.
Faster productivity growth would cushion the blow, but relying on best-case economic assumptions is exactly how past governments got into this mess. Burnham wants to build council houses, renationalize utilities, and revitalize regional transport. Those plans cost real money. With a tax burden already at historic highs and borrowing costs creeping upward, the incoming Prime Minister is completely boxed in by fiscal reality.
Stop assuming a change in leadership means a blank check for public services. To deliver even a fraction of his agenda without triggering a full-blown investor panic, Burnham will have to find cash through serious tax reform or unpalatable spending cuts elsewhere. The honeymoon is over, and the real work hasn't even begun.
