"I'll be sitting in this position by 2027," Starmer declared, joking that if our conversation went well, he might welcome us into his official residence for a follow-up talk next year.
For a PM, there's rarely ever time off for leaders. In the hour before the interview began, Starmer had been speaking with Ukraine's Volodymyr Zelensky and attempting to understand precisely had happened in Venezuela, where his close friend, US President Donald Trump, had just attacked and captured its leader, Nicolás Maduro.
When our lengthy talk, which was far more extended than typical, had concluded, Maduro had been indicted in New York.
But as the year commences, Starmer appears to have had a degree of a refresh. Maybe even just some downtime with loved ones at Chequers, the prime minister's official country residence.
This appeared to have resulted in improved morale than at the sluggish end of 2025, a dreadful annus horribilis for him.
But are he and his supporters kidding themselves if they think his standing are poised to improve?
The grisly truth for the prime minister is that numerous of his party members are convinced he's ineffective at his job. A faction of them would sooner take a risk and oust him this year.
However Starmer was dismissing such talk in the interview on Saturday morning.
Multiple times he insisted he'd be "assessed at the next election", arguing nobody would remove his five-year mandate from him – even if the most effective strategy of halting Nigel Farage and Reform UK getting to No 10 may be for Labour to replace leader.
"This is the battle of our lifetime and I intend to guide the party," he said.
The issue for the prime minister is that he will be assessed well ahead of then – in a huge set of elections in May throughout the UK. He attempted to argue, perhaps too much, that they are about who runs local authorities, and who runs the devolved administrations in Holyrood or Cardiff – and not a verdict on Westminster.
True – to some extent. But although he may not want to concede it, No 10 will be held accountable by those elections too.
This did not stop Sir Keir implying that there were no situation under which he would step down, even if a his MPs contested his leadership for the job, if those elections be catastrophic for Labour.
He tried to rationalise his unpopularity by saying the electorate was reasonably impatient for things to change. He sought to persuade me, and the nation, that this year would be a change.
The economy would strengthen despite rising unemployment, he argued, when plans the administration implemented during their initial turbulent year began to take effect.
His central point is that soon the country will "reach a turning point".
The prime minister may have communicated with greater vigour than I've seen from him for a some time – less tense, perhaps, with a longer slot to talk.
But despite encountering pressure from many directions for a more decisive approach, with greater political clarity, more vigour, more speed and more immediacy, his explanations were well-known ones.
Given that he is in this much political trouble, is a different approach required a different script?
No administration, and especially not one that has been unpopular for many months, gets everything its as planned.
The Prime Minister's challenges are not only because government is challenging, but because he and his colleagues have erred, including in the recent past.
The PM expressed regret that he regretted saying he was "delighted" to welcome back the Egyptian-British activist Alaa Abd El Fattah to the UK following an outcry when statements he'd made in the past – such as calls for Zionists and police to be killed – surfaced.
Sir Keir blamed "procedures" for not realising what the activist had said before – a more diplomatic way of saying it wasn't his responsibility.
And he is courting obvious political dangers as the year gets going. His friendship with the US president takes on a new risk after Trump's strikes on Venezuela.
Having interviewed Sir Keir Starmer, a former human rights lawyer who was against the war in Iraq, over his career, the idea he would be comfortable with these events seems far-fetched.
He asserted he was a "career-long advocate of international law" but the public "simply lack the complete details at the moment".
Some demanded condemn it before the interview. And the government is expected to face increased demands to give an explicit view in Parliament in the next few days.
There has also consistently been simmering tension in the Labour party to undo or remake some of the results of Brexit.
The PM denies he's pursuing that, but his new firmer pledge to integrate further with the European trading bloc – the vast economic European trading zone – will probably elicit howls that he is reneging on his pledge never to try to reverse the choices that followed Brexit.
A move to integrate into more of the single market will satisfy a faction on his own side, but it is prime ammunition for Reform and the Conservatives to
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