UK Gilt Crisis 2022: How £70 Billion Almost Broke Britain (Explained by a Banker)

The spoken text of the video, published 9 June 2026, lightly edited for reading. Where the video and the article differ, the article is the checked version.

Britain’s pension funds, managing 1.8 trillion pounds for millions of retirees: the most regulated, most conservative institutional investors in the country. In September 2022 they faced 70 billion pounds in emergency margin calls, in days. Not from risky bets on crypto or tech stocks, but from British government bonds, the safest asset in the country.

The Bank of England had to launch an emergency intervention to stop the collapse. The safest bonds in Britain were dismantling the core of the financial system. And the key risk that made it explode, extreme duration, is baked into every long-duration bond ETF today, even without leverage. Today’s story is a perfect example of how conservative assets can collapse completely, and a pretty entertaining story, too.

Hidden leverage. Off-balance-sheet exposures. Invisible risk. Now, the trigger that makes it all explode. I spent over 20 years in institutional banking and worked directly with the risk frameworks that failed here. [Note: the accurate figure is nearly two decades in the financial industry.] I know how pension fund leverage is supposed to be controlled, and I know exactly where those controls broke.

How one political announcement triggered the most violent bond move in modern British history. The exact chain reaction that threatened to collapse Britain’s pension system in 72 hours. And what this means for your bond allocation right now.

To understand what exploded in September 2022, you first need to understand what was loaded. British pension funds promise fixed retirement payments for life. The problem: when interest rates fall, the present cost of those promises rises. After 2008, rates collapsed globally, and pension deficits exploded.

The industry’s solution was a strategy called liability-driven investment, LDI. The idea: use derivatives and repos to hedge the interest rate risk, with leverage. For every 1 pound invested, they got 3 pounds of government bond exposure. This was not a fringe strategy. LDI strategies hedged around 1.6 trillion pounds in pension liabilities, close to two thirds of UK GDP. Three asset managers controlled roughly 70% of the market. And the stress test, the Bank of England’s worst-case scenario, set a maximum shock of 100 basis points. Remember that number.

23 September 2022. Chancellor Kwarteng steps before Parliament and announces 45 billion pounds in unfunded tax cuts, the largest in 50 years. No independent fiscal review, no credible financing plan. The global bond market delivered an instant verdict. Gilt yields exploded by 130 basis points in only three days, three times larger than any movement ever recorded in that time frame. The Bank of England later called it unprecedented. The stress test ceiling of 100 basis points shattered in only one day.

In a moment: the exact chain reaction that threatened to collapse Britain’s pension system. Five steps, 72 hours, and a central bank forced to buy bonds days after announcing it would sell them.

Imagine 50 people standing on chairs, trying to stay above rising water. One chair breaks. That person grabs the next one and pulls them down. Then more chairs break: everyone grabbing, everyone falling. The water did not rise any further, but the panic destroyed the room. This is a margin call cascade, and here’s exactly how it unfolded in the gilt market, in five steps.

Step one, the price shock. Gilt prices crashed. LDI funds held massive leveraged positions in these bonds, and the leverage amplified every percentage move into enormous mark-to-market losses.

Step two, the margin calls. The banks on the other side of these derivative contracts demanded immediate cash collateral. Not in weeks: overnight. And here’s the problem. The pension funds knew they needed cash, but their governance processes, trustee boards, formal approvals, committee sign-offs, needed days, sometimes weeks. The margin calls arrived overnight.

Step three, the fire sales. With no time and no cash, the LDI managers had no choice. They sold the only liquid asset available to them: more gilts.

Step four, the doom loop. Those forced sales crashed gilt prices further, which triggered new margin calls, which forced new sales: a self-reinforcing spiral that no individual fund could stop.

And step five, the market breaks. The bid-ask spread on 30-year gilts, the heartbeat of the market, exploded from half a basis point to 2.5 basis points, almost twice the peak during the COVID crash. The market was on life support.

The Bank of England later confirmed that multiple LDI funds were heading towards zero net asset value. If they hit zero, lenders would seize and liquidate the collateral. Pensions for millions were at risk of severe losses. In total, more than 70 billion pounds of margin calls, and 37 billion in forced gilt sales dumped into a market with no buyers.

A member of the UK Parliament put it like this: an LDI fund in the gilt market was a tuna in a paddling pool. The positions were so massive that every time one fund tried to sell, it destroyed the very market it was selling into.

So what did most people get wrong about the crisis? Two things. Myth number one: government bonds are risk-free. Institutionally, risk-free means one thing: no credit risk. Britain will pay you back in 2052. But a 30-year gilt leveraged three times loses 60% of your equity when rates move just 1%. The label risk-free ignores the one risk that almost broke Britain: duration.

Myth number two: the pensions nearly went bust, and retirees almost lost everything. The aggregate funding ratio actually rose, from 103 to 118%. Rising rates reduced the present value of future obligations faster than asset values fell. This was never a solvency crisis. It was a pure liquidity crisis in the derivatives sitting in front of the pensions. The tabloids had it exactly backwards.

Britain’s pension funds were not conservative investors. They were running leveraged carry trades on government bonds, and the Bank of England had exactly 13 trading days to stop the spiral.

Here is the impossible position the Bank of England found itself in. On 22 September, one day before the mini-budget, the Bank of England raised interest rates and announced it would start selling gilts: quantitative tightening, removing liquidity from the market. Six days later the same central bank had to emergency-buy gilts to save the market from collapse. Tightening with one hand, emergency buying with the other.

The intervention ran for exactly 13 trading days. The Bank purchased 19.3 billion pounds of gilts: 12.1 billion in conventional bonds, 7.2 billion in inflation-linked. Not quantitative easing, the Bank of England insisted, but a financial stability backstop. Temporary. Targeted. And it worked, not because of the volume, but because the announcement alone broke the panic.

But here’s the moment that defined this crisis. 11 October, Washington, D.C. The pension industry is begging for an extension of the buying programme. Governor Andrew Bailey steps to the microphone: “We will be out by the end of this week. My message to the funds involved is: you have three days to get this done.”

That was no reassurance. That was an ultimatum from the lender of last resort: rebalance now, or face the market alone. And it worked. The funds recapitalised, the programme ended on schedule, and the Bank of England sold every single gilt back into the market.

The bond market did not just price the policy. It destroyed the government that made it. On 14 October, Kwarteng was fired. Jeremy Hunt reversed nearly all of the tax cuts. On 25 October, Liz Truss resigned: 49 days as Prime Minister, the shortest in British history.

That was 2022. So why does this matter now? Fast forward to 2026: rates have come down from their peak, but they remain structurally higher than anything we saw in the 2010s. [Note: since this was recorded, UK yields have risen again. The 10-year gilt closed at 5.38% on 28 September 2026, the highest since 2007; the article covers it.] Duration risk has not disappeared. It is just quieter, and in bond markets, quiet does not mean safe.

So what does a pension fund crisis in Britain mean for your portfolio? More than you think.

Check. Check the factsheet of any bond ETF you own. Find one number: modified duration. If it says 15 or higher, a 1% rate increase means roughly a 15% price drop. This is your actual risk exposure: not default risk, but duration risk, the same risk that almost broke Britain.

Avoid. In 2022 the iShares Core UK Gilts ETF lost 28%, worse than many stock funds that year. Long-duration bond ETFs in a rising-rate environment are not conservative. They are a concentrated bet on rates staying low.

And this was not just a UK problem. From US Treasuries to euro area government bonds, long-duration funds posted double-digit losses globally in 2022. If your portfolio holds any bond ETF with a modified duration above 15, you carry the same structural risk.

Build. Build a bond ladder. Instead of one long-duration fund, build a ladder: short, medium and long maturities. Hold each position to maturity. The mark-to-market noise disappears. You collect your coupon, and you get your principal back at par.

After 2022, LDI strategies were rebuilt with far larger liquidity buffers and less fragile leverage. Regulators now expect funds to hold enough liquidity to survive at least a 250 basis point shock. The same logic works for you. Diversify your duration. Hold a cash buffer. Never be forced to sell.

So: Britain’s pension funds managed 1.8 trillion pounds. They used the safest asset in the country as collateral for leveraged bets. When the market moved against them, the safety became the weapon. Fire sales nearly destroyed the safest market in Britain. But in the final episode: the rules that protect your money, getting rewritten overnight.

If you want the full picture, the playlist is When Finance Breaks. I’m Philipp. Stay sceptical, and see you in the next one.