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UK midcaps fall as inflation worries, Starmer uncertainty weigh

Published by Global Banking & Finance Review

Posted on May 18, 2026

2 min read

· Last updated: May 18, 2026

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UK Midcap Stocks Drop as Inflation and Starmer Uncertainty Hit Investors

Market Movements and Political Developments Impacting UK Stocks

May 18 (Reuters) - UK's midcap FTSE 250 index fell on Monday as concerns about inflation and Prime Minister Keir Starmer's future cast a shadow over markets.

The FTSE 250 fell 0.59% as of 10:55 am GMT, while the blue-chip FTSE 100 index edged 0.16% higher.

Political Uncertainty Surrounding Prime Minister Keir Starmer

• Starmer will not set out a timetable for his departure, his deputy said on Monday, defying calls to quit from his party's lawmakers.

• The Prime Minister has dug his heels in despite intense pressure following a set of poor local election results earlier this month.

Potential Labour Leadership Challenge

• Last week, Greater Manchester Mayor Andy Burnham said he would seek ​to contest a parliamentary seat becoming vacant after a colleague decided to stand down, paving the way for him to challenge Starmer for the Labour leadership.

• Investors have been concerned that Burnham could usher in a period of more government spending ​and borrowing, straining Britain's already stretched public finances.

Market Reactions to Political Shifts

• "The political centre of gravity is likely to shift left. And yes, there is pressure to adapt the fiscal rules. But politicians across the spectrum are presumably acutely aware there are limits," said James Smith, developed markets economist, UK, at ING.

Inflation and Sector-Specific Market Movements

• With shipping through the Strait of Hormuz still disrupted, inflation worries have also gripped markets, particularly as oil prices stay elevated.

• Brent crude futures rose 1.1% and were on track to gain for the third consecutive session. Energy stocks rose 2.1%.

• Homebuilder stocks dropped 2.4%. Asking prices for British homes in May rose by more than usual for the time of year, property website Rightmove said.

• Bank stocks were 0.3% lower even as the finance ​ministry laid out planned changes ‌to ring-fencing rules that it said ​would create a "more ​agile and proportionate regime."

• British Gas owner Centrica rose 2.8% and was the biggest gainer on the FTSE 100, after Berenberg raised its price target on the stock.

Reporting Credits

(Reporting by Niket Nishant in Bengaluru; Editing by Nivedita Bhattacharjee)

Key Takeaways

  • FTSE 250 dropped ~0.59% by mid‑morning May 18, outpacing broader FTSE 100 which gained ~0.16%
  • Andy Burnham’s potential return to Westminster and Labour leadership challenge is unsettling markets, especially gilt investors
  • Elevated oil and energy prices — Brent crude up ~1.1% — and housing inflation (Rightmove asking prices) weighed on sentiment

Frequently Asked Questions

Why did the FTSE 250 fall on May 18?
The FTSE 250 declined due to ongoing concerns over inflation and political uncertainty regarding Prime Minister Keir Starmer's future.
Which sectors were most affected in the UK market?
Energy stocks rose, while homebuilder stocks and bank shares dropped amid inflation fears and policy concerns.
What impact did oil prices have on the market?
Elevated oil prices, driven by shipping disruptions in the Strait of Hormuz, contributed to inflation concerns and affected market performance.
What changes did the UK finance ministry announce?
The finance ministry outlined plans to update ring-fencing rules, aiming for a more agile and proportionate banking regulation regime.

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