"I will be sitting in this position by 2027," Starmer stated, noting that if the discussion was successful, he might invite us into Number 10 for a follow-up chat next year.
There is rarely ever downtime for leaders. Just an hour before the interview began, the PM had been speaking with Ukraine's Volodymyr Zelensky and trying to understand exactly what had occurred in Venezuela, where his big ally, US President Donald Trump, had just targeted and seized its leader, Nicolás Maduro.
When our interview, which was far more extended than normal, had concluded, Maduro had been charged in New York.
With the new year begins, Starmer seems to have had a degree of a refresh. Maybe even just a little relaxation with the family at Chequers, the prime minister's official country residence.
This appeared to have resulted in a more positive mood than at the saggy tail end of 2025, a awful year politically for him.
Yet, are he and his colleagues being unrealistic if they think his fortunes are poised to improve?
The harsh reality for the PM is that numerous of his colleagues think he's underperforming at his job. Some of them would sooner take a risk and remove him this year.
But Starmer was rejecting the idea when we spoke on Saturday morning.
On several occasions he told me he'd be "judged at the next election", insisting nobody would remove his electoral mandate from him – despite the fact that the most effective strategy of halting Nigel Farage and Reform UK getting to No 10 could be for Labour to replace its leader.
"This is the battle of our generation and I intend to lead us," he declared.
The problem for the prime minister is that he will be judged well ahead of then – in a huge set of elections in May across the UK. He sought to contend, perhaps excessively, that they are about who runs councils, and who runs the devolved administrations in Holyrood or Cardiff – and unrelated to Westminster.
Accurate – up to a point. But although he may be reluctant to acknowledge it, No 10 will be held accountable by those elections too.
This did not stop Sir Keir suggesting that there were no circumstances under which he would step down, even if a his MPs ran against him for the job, if those elections prove disastrous for Labour.
He attempted to explain his unpopularity by saying the voters was naturally eager for things to change. He aimed to assure me, and the nation, that 2026 would be different.
The economic situation would recover despite rising unemployment, he said, when policies the government enacted during their first choppy year began to show results.
His core point is that soon the country will "turn the corner".
The PM may have communicated with greater vigour than observed from him for a some time – calmer, maybe, with a longer slot to talk.
But despite encountering pressure from within his own party for a bolder strategy, with increased political clarity, more dynamism, more pace and more immediacy, his points were repeated ones.
When he finds himself in such significant political trouble, should he consider a new narrative?
No government, and especially not one that has been unpopular for an extended period, gets everything its own way.
The Prime Minister's challenges are not just because government is hard, but because he and his colleagues have erred, including in the last few weeks.
The PM expressed regret that he was sorry for saying he was "happy" to welcome back the Egyptian-British activist Alaa Abd El Fattah to the UK after an outcry when statements he'd previously made – such as calls for Zionists and police to be killed – surfaced.
Starmer blamed "procedures" for not realising what the activist had said before – a fancier way of saying not my fault.
And he is courting clear political risks as the year unfolds. His close relationship with the US president takes on a new complication after Trump's intervention on Venezuela.
Having interviewed Sir Keir Starmer, a ex- human rights lawyer who opposed the war in Iraq, over many years, the thought he would be content with this kind of intervention seems far-fetched.
He told me he was a "longtime advocate of international law" but we "just do not have the entire story at the moment".
Opponents demanded condemn it before the interview. And the government is likely to face increased demands to give an definitive view in Parliament in the near future.
There has also consistently been growing pressure in the Labour ranks to revisit some of the results of Brexit.
The PM rejects he's heading in that direction, but his new specific pledge to integrate further with the EU's single market – the huge economic European trading zone – will probably elicit howls that he is breaking his vow never to try to undo the results that flowed from Brexit.
A commitment to integrate into more of the single market will please a faction on his backbenches, but it is easy fodder for Reform and the Conservatives to
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