Britain’s bond market delivered its sharpest rebuke yet to Sir Keir Starmer’s premiership on Tuesday, with 30-year gilt yields climbing to their highest level this century as the prime minister stared down a growing chorus of Labour MPs demanding he step aside.
The sell-off, which dragged sterling and equities lower in lockstep, wiped out the relief rally that followed Starmer’s defiant intervention last week. Tuesday’s cabinet meeting, at which the prime minister once again refused to countenance resignation, did little to settle nerves. Investors are now openly pricing in the prospect of a leftward lurch in Labour policy, with the attendant risks of looser fiscal rules, higher gilt issuance and a further squeeze on the cost of capital for British business.
For the country’s 5.5 million small and medium-sized enterprises, the implications are far from academic. Higher long-dated gilt yields feed directly into the swap rates that underpin commercial lending, business mortgages and asset finance, raising the prospect of yet another leg up in the borrowing costs faced by Britain’s corporate backbone at a time when many are still nursing the legacy of post-pandemic debt.
The 30-year gilt yield rose 13 basis points to 5.81 per cent, the highest since May 1998. The benchmark 10-year yield gained 10 basis points to 5.1 per cent, within a whisker of breaching the post-2008 peak it set earlier this month. Bond prices move inversely to yields.
“A new Labour leader may face pressure to ease the fiscal rules and raise gilt issuance,” warned Jim Reid, analyst at Deutsche Bank, capturing the City’s central concern that any successor would lean towards higher spending and heavier taxation of the very businesses the Treasury is counting on to drive growth.
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