British share indices moved higher on June 12 after comments from U.S. President Donald Trump that a peace agreement with Iran might be signed soon, with investors weighing that news alongside key domestic economic data.
By 1059 GMT the benchmark FTSE 100 had risen 1.1% to 10,414.02 points, while the FTSE 250 midcap index climbed around 1.5%. Both indices were positioned to record weekly gains.
Market participants reacted to the possibility that a confirmed deal could bring an end to the three-month-old war that had pushed oil prices sharply upward after Iran's blockade of the Strait of Hormuz - a critical maritime route for global energy flows. After the peace-related remarks, oil prices slipped by more than 4%, and the energy sector fell 3.6%, making it the only sub-index in negative territory on the session.
At the sector level, homebuilders were among the strongest performers. Vistry Group led the gains with a rise of 6.6%, while Bellway and Persimmon each advanced about 4%. Travel and leisure stocks also outperformed, the sub-index advancing roughly 3.6%, with British Airways owner IAG and budget carrier Wizz Air listed among the top risers.
Market data embedded in the trading screen showed several individual moves: BWY rose 4.2%, VTYV gained 6.23%, PSN increased 4.13%, ICAG climbed 6.61%, and WIZZ was up 7.9%. By contrast, LCO - a crude oil benchmark - was down 3.85%. The broader UK100 and FTMC readings were higher by about 1.25% and 1.57% respectively.
On the economic front, the Office for National Statistics reported that the UK economy contracted by 0.1% in April, marking the first monthly decline since August 2025. The ONS also noted this as the first clear evidence that the U.S.-Israeli war on Iran had begun to affect the country's economic growth.
"April's data hints at what is to come, a summer of sluggishness which could edge into a technical recession as global conflict collides with domestic political uncertainty," said Danni Hewson, head of financial analysis at AJ Bell.
Separately, the Bank of England's quarterly inflation attitudes survey released on Friday showed that the British public's long-term inflation expectations rose to a record high last month.
Some market intelligence tools and strategy screens on trading platforms flagged the moves in individual stocks and sectors, and related algorithmic strategies highlighted momentum in select names. Promotional material on the trading screen also referenced model-driven stock-picking services that evaluate companies across multiple financial metrics, noting historical highlighted winners, though such services and past performance references were presented as part of platform features and not as market forecasts.