The political arithmetic shifted materially this week. Andy Burnham's commitment to maintain current fiscal rules removed the most credible alternative leadership scenario and triggered a 30 basis-point rally in Gilt yields — the largest weekly move since late 2023. The bond market's verdict on UK political risk is now legible: Burnham fiscal credibility is worth approximately 30bp at the long end. Starmer survives, for now, by the arithmetic of the Burnham commitment rather than by any recovery in his own authority.

The Makerfield by-election on 18 June will test whether that arithmetic holds in practice. A Reform UK hold on a substantial margin ends the conversation about Labour's electoral viability before the next general election begins. The government's own Cobra modelling continues to frame a June Strait closure as the reasonable worst-case scenario. We are in that scenario. The policy levers available to ease the coming food and energy price pressure are limited. The levers available to make it worse remain numerous and accessible.

Into this landscape walked Tony Blair, with a long essay on the broken state of British politics and an implicit audition for the role of elder statesman. He is right about several things: that Labour's civil war is dangerous at a perilous moment in world affairs, that the European flag is a facile evasion, and that the party possesses — in his own phrase — an "almost infinite capacity for self-delusion." These are observations available to any reasonably attentive reader of the morning papers.

What his essay does not address is the causal chain. The UK's structural vulnerability to an oil shock of precisely this kind — the gas dependency, the hollowed industrial base, the energy policy vacuum — was assembled during his tenure and left to compound through the years that followed. The financialisation of the British economy that concentrated talent in City rent extraction at the expense of northern engineering; the moment in 2006, unremarked at the time, when the UK became a net oil importer; the nuclear decisions that were never quite made despite a German utility executive warning in 2007 that Britain was "in a very bad situation" — these are not footnotes to the current crisis. They are its load-bearing walls.

A former prime minister offering a diagnosis of broken Britain while declining to account for his own chapter of the story is engaging in a familiar form of political theatre. The Record notes it without excessive comment. The Makerfield by-election will deliver a verdict more consequential than anything in Blair's essay — and it will be delivered by precisely the communities his economic model left behind.

Investors want to know what comes next. The honest answer is that we cannot predict the future. The useful answer is that we have seen the components of the current situation before — separately, in different configurations — and in each historical instance, the resolution was neither swift nor painless. The question worth examining this week is whether the combination is more or less dangerous than any of its precedents. The answer, on the evidence, is more.

The 1973 template. The first oil shock arrived into an equity market that was expensive but not at a generational valuation extreme — the CAPE in 1973 was approximately 18, close to its long-run average. Government debt across the G7 was below 40% of GDP. The Fed raised its benchmark rate from 5.75% in 1972 to 12% by 1974 and still could not contain prices. US GDP contracted; unemployment climbed from 4.6% to 9% by May 1975. That was the first shock — with fiscal headroom, without a debt overhang, and with a central bank that retained the political room to act. The UK experience was characteristically worse: inflation peaked almost a year later than the G7 average and, when the second shock arrived in 1979, the UK peak was larger than any comparable economy except Italy.

The 1979 template. The second shock hit an economy already weakened by the first. Central banks had reverted to stimulatory policies through the late 1970s — causing a real output boom — only to find that a public which had lived through the first shock had updated its inflation expectations accordingly. Stimulatory policy became less effective; inflation became more persistent. Only when Paul Volcker stepped in and insisted on the primacy of the inflation objective — rates above 20%, unemployment above 10% — was the cycle broken. The cure was brutal and it worked. It worked because the fiscal starting position made it survivable: US debt-to-GDP in 1979 was approximately 30%. The UK's was comparable. Thatcher could absorb the contraction because the balance sheet allowed it.

The 2026 configuration. Six of the G7 nations now carry government debt above 100% of GDP. Only Germany retains sufficient fiscal headroom to absorb a demand shock without risking a further rise in long-end yields. The Volcker option — sustained high rates applied until inflation breaks — would, applied to a sovereign carrying 100% debt-to-GDP at already elevated interest costs, collapse the fiscal position before it collapsed inflation. This is not a political observation. It is an arithmetic one. Central banks know it. Bond markets know it. It is the reason 5%+ Gilt yields, briefly available to investors between 18 and 22 May, were historically significant: they were pricing the scenario in which the Bank of England has no good choice available to it.

The CAPE ratio at 42.66 — exceeded only at the dot-com peak — sits above the 1929 pre-crash level of approximately 32 and materially above the 2007 pre-crisis level of 27. In 1973, the equity market was not at a generational valuation extreme. In 1929, there was no concurrent supply shock. In 1979, governments had the fiscal headroom to deploy Volcker. In 2026, all three conditions are present simultaneously: a supply shock of comparable magnitude to 1973, equity valuations approaching 1929, and fiscal positions across the G7 that preclude the Volcker response. The historical record offers no precise precedent for this combination. What it does offer is a clear map of how each component resolves individually — and in no historical instance has any of them resolved painlessly from the levels at which we find ourselves.

The bond market has not yet priced depression. This is the signal worth watching — and the fact that it has not fired is itself information. The UK 30-year Gilt touched 5.78% on 5 May, its highest since 1998, and fell 30 basis points in the week ending 27 May. The US 30-year Treasury peaked at 5.2% — its highest since 2007 — before retreating to approximately 4.97%. In both cases, the move down was driven by Iran deal optimism and political stabilisation, not by recession pricing. The long end has not rallied through the short end. The curve has flattened but not inverted. The Estrella-Mishkin recession probability model puts the UK at an elevated reading, but not yet at the threshold that historically preceded imminent recession.

When the bond market prices depression, it will look different from this week's move: long yields falling sharply while short yields remain anchored; the curve inverting with force; the 30-year trading well below the policy rate. That signal has not fired. Its absence means the deflationary scenario — for all its logical coherence — remains the unpriced tail. When it does price, the move will be fast and will not wait for confirmation from equities. The equity market, at current valuations, will not lead that adjustment. It will follow it.

The markets are priced for the scenario where none of this matters. That is not optimism. It is the absence of a framework for thinking about it.