The FTSE 100 hovered around 10,350 in early trading on Monday as investors weighed political uncertainty in the UK against encouraging developments in US-Iran negotiations. Reports indicate that Prime Minister Keir Starmer is considering stepping down and could announce a timetable for his departure in the coming hours, raising concerns over the UK's political outlook. On the geopolitical front, the US and Iran have made encouraging progress during talks in Switzerland, with technical-level discussions set to continue this week, supporting market sentiment. Investors are looking ahead to the UK flash PMI data this week, which will provide fresh insight into business activity and the state of the domestic economy. Notable losses were seen in Unilever (-1.0%), BAE Systems (0.9%), and Haleon (-1.1%), while mining stocks outperformed, with Antofagasta (+1.8%) and Fresnillo (+1.2%) leading the gains.