On Tuesday, September 15, the yield on 30-year UK gilts sits near 5.93% - the highest since 1998, according to Trading Economics. It touched 5.96% intraday and reached 5.948% on September 10, Reuters reported. The 10-year gilt yield has climbed to 5.39%, the highest since July 2007 - the eve of the subprime crisis.
Fig. 1. G7 30-year government bond yields, September 15, 2026. Source: Investing.com, Trading Economics.
Britain stands alone: 5.93% versus 5.37% for the US, 5.14% for France, 5.06% for Italy, 4.28% for Canada, 4.16% for Japan and 3.89% for Germany. The 10-year picture is the same. According to Reuters, only Australia borrows more among larger advanced economies, but within the G7 Britain is first. And strictly speaking this is not a crash: a crash is when there are no buyers, and here the opposite is true.
Fig. 2. UK gilt yield curve, September 15, 2026. Source: Trading Economics.
The curve shows the gap clearly: 30-year gilts yield almost 0.5 points more than 10-year and almost 2 points more than 2-year. Goldman Sachs expects the Bank of England to hold Bank Rate at 3.75% on Thursday and to hike in November, while the Fed is expected to move sooner, on Wednesday.
Fig. 3. UK 30-year gilt yield, daily, August 17 - September 15, 2026. Source: Investing.com.
For the budget the arithmetic is simple. Every new issue at 5.8-5.9% locks in a high rate for decades, and the long end of the curve costs more than the short end. That is why October 28, when Healey delivers the budget, matters more to the market than any single yield print.
Fig. 1. G7 30-year government bond yields, September 15, 2026. Source: Investing.com, Trading Economics.
Britain stands alone: 5.93% versus 5.37% for the US, 5.14% for France, 5.06% for Italy, 4.28% for Canada, 4.16% for Japan and 3.89% for Germany. The 10-year picture is the same. According to Reuters, only Australia borrows more among larger advanced economies, but within the G7 Britain is first. And strictly speaking this is not a crash: a crash is when there are no buyers, and here the opposite is true.
Why the long end, specifically
Short rates track the Bank of England, while long rates track inflation, the budget and the global term premium. On all three fronts Britain looks worse than its G7 peers:- oil: Brent above $108 a barrel and European gas near multi-year highs after another round of Middle East conflict;
- inflation: it accelerated to 2.9% in July, a November Bank of England hike is priced at about 97%, and markets expect four hikes by mid-2027;
- fiscal risk: new finance minister John Healey is preparing his first budget for October 28, and the OBR already puts debt interest at £109 billion - 8.4% of all public spending;
- demand: pension funds have largely left the long-gilt market, replaced by more yield-sensitive foreign investors.
Fig. 2. UK gilt yield curve, September 15, 2026. Source: Trading Economics.
The curve shows the gap clearly: 30-year gilts yield almost 0.5 points more than 10-year and almost 2 points more than 2-year. Goldman Sachs expects the Bank of England to hold Bank Rate at 3.75% on Thursday and to hike in November, while the Fed is expected to move sooner, on Wednesday.
What it means for the budget
History matters more than the level. Yields were last this high in 1998, but the debt was a fraction of today's. On September 8 Britain sold £4.25 billion of 30-year gilts at a yield of 5.8168% - a record since the Debt Management Office was created in 1998 and above the previous 5.79% peak set in May 1998. Tellingly, demand was heavy: orders reached almost £85 billion. The problem is not that nobody buys gilts, but the price at which they now sell.Fig. 3. UK 30-year gilt yield, daily, August 17 - September 15, 2026. Source: Investing.com.
For the budget the arithmetic is simple. Every new issue at 5.8-5.9% locks in a high rate for decades, and the long end of the curve costs more than the short end. That is why October 28, when Healey delivers the budget, matters more to the market than any single yield print.
⚠ IMPORTANT
Verdict: "crash" is a strong word, but the gist is right. Britain pays more on long debt than anyone else in the G7, and it is not just the yield that is rising but the cost of any mistake. If oil does not retreat and the Bank of England does hike in November, 6% on 30-year gilts will stop being a ceiling.
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