"I'll remain in the same position by 2027," Starmer stated, joking that if the discussion went well, he might invite the interviewer into Number 10 for another conversation next year.
There is never truly break for prime ministers. In the hour before the interview began, the PM had been in calls with Ukrainian President Volodymyr Zelensky and attempting to understand precisely had transpired in Venezuela, where his close ally, US President Donald Trump, had recently attacked and captured its leader, Nicolás Maduro.
When the discussion, which was considerably lengthier than typical, had ended, Maduro had been charged in New York.
But as the year commences, Sir Keir appears to have had a kind of a revitalisation. Maybe even just a little relaxation with his family at Chequers, the prime minister's official country residence.
That certainly seemed to have resulted in a more positive mood than at the difficult conclusion of 2025, a dreadful year politically for him.
Yet, are he and his supporters kidding themselves if they reckon his political fate are about to turn around?
The harsh truth for the leader is that a significant number of his fellow MPs are convinced he's ineffective at his job. Some of them would sooner take a risk and oust him in 2026.
But Starmer was dismissing such talk during our conversation on Saturday morning.
On several occasions he told me he'd be "evaluated at the poll", maintaining nobody would remove his term from him – despite the fact that the optimal path of halting Nigel Farage and Reform UK reaching No 10 might be for Labour to change its leader.
"We are in the struggle of our generation and I aim to be at the forefront," he declared.
The problem for the PM is that he will be scrutinised well ahead of then – in a huge set of elections in May throughout the UK. He attempted to protest, maybe too much, that they are about who runs councils, and who runs the governments in Holyrood or Cardiff – and unrelated to Westminster.
True – up to a point. But even though he may be reluctant to acknowledge it, No 10 will be evaluated by those elections too.
Despite this, Sir Keir suggesting that there were no circumstances under which he would resign, even if a his colleagues ran against him for the job, if those elections be very poor for Labour.
He sought to account for his unpopularity by saying the public was reasonably anxious for things to improve. He tried to convince me, and the nation, that the coming months would be different.
The economy would recover despite rising unemployment, he said, when strategies the government put in place during their initial choppy year began to show results.
His core argument is that soon the country will "see an improvement".
The PM may have spoken with more energy than observed from him for a some time – less tense, perhaps, with a longer slot to talk.
But despite facing demands from many directions for a more decisive strategy, with much more political vision, more dynamism, more pace and more urgency, his points were repeated ones.
When he finds himself in this much political difficulty, is a different approach required a new narrative?
No administration, and certainly not one that has been struggling in the polls for an extended period, gets everything its own way.
Sir Keir's challenges are not just because governing is hard, but because he and his colleagues have made mistakes, even in the recent past.
The prime minister expressed regret that he regretted saying he was "delighted" to see the return of the Egyptian-British activist Alaa Abd El Fattah to the UK following an backlash when comments he'd previously made – including calls for Zionists and police to be killed – came to light.
Starmer attributed it to "procedures" for not catching what the activist had said before – a more diplomatic way of saying it wasn't his responsibility.
And he is inviting evident political risks as the year progresses. His alliance with the US president acquires a new complication after Trump's strikes on Venezuela.
Having interviewed Sir Keir Starmer, a ex- human rights lawyer who was against the war in Iraq, over his career, the notion he would be at ease with these events seems implausible.
He told me he was a "longtime advocate of international law" but the public "just do not have the full picture at the moment".
Critics wanted him to criticise the action prior to the interview. And the government is expected to face further scrutiny to give an explicit view in Parliament in the near future.
And there has consistently been bubbling tension in the Labour party to revisit some of the outcomes of Brexit.
The PM disputes he's pursuing that, but his new firmer plan to move closer with the EU's single market – the giant economic European trading zone – will likely elicit accusations that he is going back on his pledge never to try to undo the decisions that flowed from Brexit.
A decision to cosy up to more of the single market will please many on his backbenches, but it is simple material for Reform and the Conservatives to
Elena Voss is a seasoned journalist and editor with over a decade of experience in digital media, specializing in global affairs and tech trends.