"I will be positioned in the same position by 2027," Starmer declared, noting that if the interview was successful, he might welcome us into Downing Street for a follow-up chat in the coming year.
There is never any time off for leaders. In the hour before our chat started, Sir Keir had been on the phone with Ukrainian President Volodymyr Zelensky and working to decipher exactly what had happened in Venezuela, where his key political chum, US President Donald Trump, had just attacked and captured its leader, Nicolás Maduro.
When our lengthy talk, which was far more extended than normal, had concluded, Maduro had been formally accused in New York.
But as the year commences, the Prime Minister appears to have had a degree of a revitalisation. Maybe even just some relaxation with his family at Chequers, the prime minister's official country residence.
This seemed to have put him in better spirits than at the sluggish tail end of 2025, a dreadful political year for him.
But are he and his supporters being unrealistic if they reckon his fortunes are about to get better?
The grisly truth for the PM is that numerous of his colleagues think he's not very good at his job. Several of them would sooner gamble and remove him in 2026.
But Sir Keir was rejecting the idea during our conversation on Saturday morning.
Repeatedly he insisted he'd be "judged at the general election", maintaining no one would take his electoral mandate from him – even if the optimal path of stopping Nigel Farage and Reform UK getting to No 10 might be for Labour to change its leader.
"We are in the battle of our generation and I plan to be at the forefront," he affirmed.
The challenge for the prime minister is that he will be assessed far sooner than then – in a huge set of elections in May throughout the UK. He attempted to contend, maybe too much, that they are about who runs councils, and who runs the devolved administrations in Holyrood or Cardiff – and not about Westminster.
True – up to a point. But although he may not want to acknowledge it, No 10 will be held accountable by those elections too.
Despite this, Sir Keir implying that there were no scenario under which he would step down, even if a his colleagues ran against him for the job, if those elections be very poor for Labour.
He sought to rationalise his unpopularity by saying the voters was reasonably impatient for things to improve. He sought to assure me, and the nation, that 2026 would be different.
The economy would improve in the face of rising unemployment, he claimed, when policies the government put in place during their first turbulent year began to take effect.
His big argument is that in 2026 the country will "turn the corner".
The PM may have spoken with more energy than I've seen from him for a while – calmer, perhaps, with a longer slot to talk.
But despite encountering calls from many directions for a bolder approach, with greater political clarity, more vigour, more pace and more immediacy, his explanations were well-known ones.
When he finds himself in considerable political difficulty, should he consider a different script?
No administration, and certainly not one that has been struggling in the polls for many months, gets everything its as planned.
Sir Keir's challenges are not just because government is hard, but because he and his team have faltered, including in the recent past.
The prime minister told me that he regretted saying he was "happy" 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 – resurfaced.
Sir Keir blamed "the system" for not realising what the activist had said before – a more diplomatic way of saying not my fault.
And he is courting clear political perils as the year gets going. His friendship with the US president entails a new complication after Trump's strikes 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 at ease with this kind of intervention seems unlikely.
He stated he was a "longtime proponent of international law" but the public "simply lack the complete details at the moment".
Opponents wanted him to denounce it prior to the interview. And the administration is expected to face more pressure to give an explicit view in Parliament in the coming days.
And there has long been growing desire in the Labour ranks to undo or remake some of the results of Brexit.
Sir Keir rejects he's pursuing that, but his new specific commitment to integrate further with the European trading bloc – the vast economic European market – will probably elicit howls that he is going back on his vow never to try to undo the results that flowed from Brexit.
A move to integrate into more of the single market will satisfy many on his side of the party, but it is easy fodder for Reform and the Conservatives to
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