Former Prime Minister Sir Keir Starmer has announced his resignation as a member of parliament, bringing an end to months of speculation regarding his political future following his departure from Downing Street earlier this year. The decision will necessitate a by-election in his central London constituency of Holborn and St Pancras, a safe seat he has held since 2015.

Sir Keir stepped down as prime minister in July following a period of intense political turmoil and internal pressure that unravelled his administration just years after securing a sweeping electoral victory. Although he initially indicated an intention to remain on the backbenches until the next scheduled general election, he stated in an interview that the moment had arrived to hand over responsibility to a new representative.

Explaining his reasons for leaving the legislature, the former Labour leader noted that he intends to concentrate his efforts on global diplomacy and humanitarian advocacy. Specifically, he plans to engage in initiatives addressing international security, trade, technology, and defence, alongside ongoing efforts to combat violence against women and girls—a cause he championed prior to entering Parliament.

The timing of the announcement has drawn swift political reaction, landing just hours before his successor, Prime Minister Andy Burnham, is scheduled to make his inaugural appearance and address in the House of Commons. Opposition figures were quick to criticise the move, with Conservative chairman Kevin Hollinrake pointing out that the departure breaks previous commitments to serve out the parliamentary term and will result in the expense of a local electoral contest.

Holborn and St Pancras has historically functioned as a reliable stronghold for the Labour Party, where Sir Keir maintained a comfortable majority exceeding 11,000 votes during the 2024 general election. However, upcoming local voting trends suggest the contest may see robust competition, with the Green Party having secured a significant share of the vote in recent municipal contests across the area. Representatives for the Greens have indicated that party leader Zack Polanski, currently serving on the London Assembly, is weighing a potential candidacy.

The departure places Sir Keir among a minority of recent British leaders who swiftly exited the House of Commons following their tenure as prime minister, echoing the prompt departures of David Cameron and Boris Johnson. In contrast, several other recent occupants of Downing Street chose to remain active backbench MPs for extended periods after vacating the premiership.

A formal schedule for the upcoming by-election will not be established until Sir Keir formally submits his resignation from the House of Commons. Political parties are expected to announce their respective candidates in the coming weeks as preparations for the parliamentary contest begin.

Reporting based on coverage first published by BBC News. Read the original report at BBC News.