British financial markets are bracing for prolonged uncertainty after a dramatic implosion within the governing Labour Party triggered a sell-off in UK government bonds and weighed on investor sentiment toward UK equities.
In a turbulent stretch of political drama this week, Health Secretary Wes Streeting resigned from cabinet, declaring he had “lost confidence” in Prime Minister Sir Keir Starmer’s leadership.
Former deputy PM Angela Rayner made a high-profile return following the resolution of her tax dispute, while Greater Manchester Mayor Andy Burnham announced plans to contest a by-election in Makerfield — widely seen as his launchpad for a full leadership challenge.
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Starmer, battered by Labour losing nearly 1,500 councillors in May’s local elections and suffering heavy losses in Wales and Scotland, is vowing to fight on. However, the BBC reports nearly 90 Labour MPs have now called for his resignation.
The turmoil has landed squarely on the FTSE 100’s doorstep. UK gilt prices fell sharply as traders priced in political risk and potential policy instability, with the Financial Times reporting bond markets are “bracing for Burnham.”
UK bosses have publicly slammed Westminster’s dysfunction, warning it risks paralyzing economic decision-making. The FTSE 100 declined 1.7% on Friday, extending a broader pullback from April highs.
Analysts warn a prolonged Labour leadership contest — with candidates like Streeting openly advocating EU re-entry — could reignite Brexit uncertainty, adding further headwinds to sterling, gilts, and domestic-facing mid-cap stocks on the FTSE 250.
With the Makerfield by-election expected on 18 June, markets may face weeks of political noise before any resolution.
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