Andrew Prosser, head of investments at InvestEngine, said: “The King’s Speech took place against an extraordinary political backdrop, as Prime Minister Keir Starmer attempted to rally his party and defend his premiership.
“But quite literally as the King entered Parliament to deliver the government’s legislative agenda, markets and commentators were already preoccupied by reports that Health Secretary Wes Streeting was preparing a leadership challenge.
“Streeting is expected to confirm his resignation and bid today, and with Energy Secretary Ed Miliband, former Deputy PM Angela Rayner and Manchester Mayor Andy Burnham all speculated to enter the race, the uncertainty shows no sign of abating.
“While markets crave stability, the current situation offers very little of that. UK government bond yields climbed sharply, reaching their highest since 2008 this week, easing only briefly after Starmer made clear he intended to fight on.
“If a leadership challenge does kick off today, it could push those costs higher but early signs are that markets have started to price in the political instability.
“As of this morning (May 14), gilt yields have edged slightly lower from their peaks, with the 30-year yield at around 5.72 per cent and the 10-year at 5.05 per cent.
“This fall in yields comes as speculation that Streeting – seen as fiscally disciplined and the “continuity candidate” – could be a likely successor, which is easing fears of a left-leaning higher-spending replacement.
“Either way, the higher cost of borrowing will make it harder for any government to implement its legislative agenda, whoever leads it.
“The FTSE 250, which has significant domestic exposure, also fell 1.1 per cent earlier this week as uncertainty took hold, and the pound has also come under pressure, falling around 0.25 per cent over the last five days.
“For retail investors in the UK, domestic political instability can feel more unsettling than distant geopolitical shocks, given they involve familiar faces and institutions.
“But the principle is the same as it was for US tariffs, the Middle East escalation or other shocks of recent times: the best returns often follow the sharpest drops, and investors who exit at the point of maximum noise tend to miss the recovery.
“It also underlines why diversifying across sectors and markets helps cushion the impact of any domestic instability.
“Whatever happens next in Westminster, the message to investors is a simple one – take a breath, zoom out, and don’t let today’s headlines drive long-term decisions.”
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