Starmer leaves Holborn and St Pancras six weeks after leaving No 10

Keir Starmer will stand down as the Labour member for Holborn and St Pancras, he told the Camden New Journal on 1 September. The announcement came hours before Andy Burnham, who replaced him as prime minister in July, faced his first Prime Minister’s Questions.

Starmer has held the central London seat since 2015, when he succeeded Frank Dobson. He had said, after leaving Downing Street, that he would stay on the back benches until the next general election, which must be held by 2029. He has now reversed that.

“Over the summer, I have had time to reflect and consider my future. I have decided that now is the right time to step down as MP for Holborn and St Pancras and hand the baton over to a successor,” he wrote. He called the constituency “the best in the country” and said it had been an honour to follow Dobson.

What he says he will do next

“I will now focus on other things and that will be international affairs including defence, security, trade and technology in a fast-changing world. I will also continue, as I have done for a long time now with others, work on combating violence against women and girls.”

He did not name an institution, a UN brief, or a private role. He did answer his own test. “I think once you’ve been prime minister, it’s important to answer the question: what are you going to do next? Having decided I’m going to concentrate on international affairs, I think it’s right to step down.”

Burnham’s office issued a tribute. Starmer, it said, had taken Labour from one of its worst defeats to its best victory and built a platform the new leadership would use. Conservative chairman Kevin Hollinrake called it “fitting” that Starmer’s last act as a lawmaker was to reverse a pledge to stay.

The by-election the Greens want

Holborn and St Pancras is a Labour stronghold. A vacancy there is still a national event because it is the first London by-election since Boris Johnson left Uxbridge and South Ruislip in 2013, and the seventh of this Parliament. Green Party leader Zack Polanski is considering a run. A party spokesperson said he had always wanted a London seat.

The timing is pointed. Burnham’s first PMQs landed on a 5.27 percent 10-year gilt, the highest since 2008, and on an Autumn Budget date of 28 October. Starmer chose the local paper, not the chamber, and left the same morning the new prime minister had to explain borrowing costs driven by oil and the Iran war.

Eleven years as an MP, 20 months as prime minister, six weeks as a former prime minister on the back benches: that is the completed domestic sequence. The international brief he described has no letterhead yet. Until it does, the only concrete consequence is a writ for Holborn and St Pancras and a contest that Labour must now defend in the city it still treats as safe.