"I will remain in the same office by 2027," Starmer declared, joking that if the conversation went well, he might welcome us into Number 10 for a follow-up conversation in 2026.
There is never any break for prime ministers. In the hour before the interview began, Sir Keir had been speaking with Ukrainian President Volodymyr Zelensky and attempting to decipher precisely had happened in Venezuela, where his big ally, US President Donald Trump, had just targeted and seized its leader, Nicolás Maduro.
Once our interview, which was considerably lengthier than usual, had finished, Maduro had been charged in New York.
With the year commences, Starmer seems to have had a degree of a reboot. Maybe even just a little relaxation with loved ones at Chequers, the prime minister's country retreat.
This seemed to have resulted in better spirits than at the saggy tail end of 2025, a awful annus horribilis for him.
Yet, are he and his allies kidding themselves if they think his standing are about to improve?
The uncomfortable truth for the leader is that numerous of his fellow MPs believe he's not very good at his job. Some of them would sooner gamble and oust him this year.
But Sir Keir was dismissing such talk when we spoke on Saturday morning.
Multiple times he told me he'd be "evaluated at the poll", arguing nobody would strip his term from him – even if the optimal path of halting Nigel Farage and Reform UK entering No 10 could be for Labour to switch leader.
"This is the struggle of our times and I aim to lead us," he declared.
The problem for the prime minister is that he will be judged long before then – in a mega set of elections in May throughout the UK. He attempted to protest, perhaps too much, that they are about who runs local authorities, and who runs the governments in Holyrood or Cardiff – and unrelated to Westminster.
Accurate – to some extent. But although he may not want to concede it, No 10 will be evaluated by those elections too.
Despite this, Sir Keir stating that there were no situation under which he would walk away, should one of his MPs challenged him for the job, should those elections prove disastrous for Labour.
He tried to rationalise his low poll ratings by saying the voters was reasonably eager for things to get better. He aimed to persuade me, and the public, that this year would be a change.
The economic situation would recover notwithstanding rising unemployment, he claimed, when strategies the administration implemented during their first turbulent year began to show results.
His big point is that in 2026 the country will "reach a turning point".
The prime minister may have communicated with renewed vitality than observed from him for a while – less tense, maybe, with more time to talk.
However, in spite of encountering pressure from many directions for a bolder strategy, with much more political vision, more vigour, more pace and more immediacy, his points were familiar ones.
When he finds himself in such significant political peril, should he consider a change of tack?
No administration, and especially not one that has been struggling in the polls for many months, has everything its own way.
The Prime Minister's problems are not just because governing is difficult, but because he and his colleagues have made mistakes, even in the recent past.
The PM admitted that he regretted saying he was "delighted" to welcome back the Egyptian-British activist Alaa Abd El Fattah to the UK after an backlash when statements he'd made in the past – such as calls for Zionists and police to be killed – resurfaced.
Sir Keir attributed it to "the system" for failing to identify what the activist had said before – a more diplomatic way of saying it wasn't his responsibility.
And he is facing clear political perils as the year gets going. His close relationship with the US president takes on a new risk after Trump's military action 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 content with such action seems far-fetched.
He told me he was a "lifelong advocate of international law" but the public "simply lack the entire story at the moment".
Opponents demanded condemn it prior to we spoke. And the administration is expected to face increased demands to give an clear view in Parliament in the next few days.
There has also consistently been growing desire in the Labour party to revisit some of the results of Brexit.
Sir Keir denies he's doing that, but his new firmer commitment to move closer with the EU's single market – the huge economic European market – will probably elicit howls that he is reneging on his vow never to try to reverse the decisions that stemmed from Brexit.
A move to integrate into more of the single market will satisfy many on his backbenches, but it is easy fodder for Reform and the Conservatives to