"I will remain in this seat by 2027," Starmer declared, noting that if the discussion was successful, he might invite the interviewer into Downing Street for another talk in the coming year.
There is never any time off for prime ministers. Shortly before we sat down, Sir Keir had been on the phone with Ukraine's Volodymyr Zelensky and attempting to decipher precisely had transpired in Venezuela, where his big ally, US President Donald Trump, had just launched a strike against and detained its leader, Nicolás Maduro.
Once the discussion, which was considerably lengthier than usual, had ended, Maduro had been charged in New York.
But as the year starts, the Prime Minister seems to have had a kind of a revitalisation. Maybe even just a little a rest with loved ones at Chequers, the prime minister's official country residence.
This seemed to have resulted in better spirits than at the saggy end of 2025, a dreadful annus horribilis for him.
But are he and his allies kidding themselves if they think his political fate are set to get better?
The grisly truth for the leader is that many of his colleagues think he's ineffective at his job. Some of them would sooner gamble and oust him in 2026.
But Starmer was dismissing such talk in the interview on Saturday morning.
On several occasions he stated he'd be "judged at the poll", arguing no one would strip his five-year mandate from him – even if the most effective strategy of preventing Nigel Farage and Reform UK entering No 10 could be for Labour to replace its leader.
"We are in the battle of our lifetime and I plan to lead us," he affirmed.
The challenge for the PM is that he will be scrutinised far sooner than then – in a huge set of elections in May throughout the UK. He sought to argue, perhaps too much, that they are concerning who runs councils, and who runs the devolved administrations in Holyrood or Cardiff – and not about Westminster.
Accurate – up to a point. But although he may not want to admit it, No 10 will be judged by those elections too.
This did not stop Sir Keir stating that there were no circumstances under which he would resign, should a his MPs ran against him for the job, should those elections be disastrous for Labour.
He sought to account for his unpopularity by saying the electorate was reasonably eager for things to get better. He aimed to convince the interviewer, and the public, that 2026 would be a change.
The economic situation would improve notwithstanding rising unemployment, he claimed, when policies the administration enacted during their first choppy year began to take effect.
His core argument is that this year the country will "reach a turning point".
The prime minister may have spoken with renewed vitality than observed from him for a while – less tense, perhaps, with more time to talk.
However, in spite of encountering pressure from many directions for a bolder strategy, with much more political vision, more dynamism, more pace and more immediacy, his points were repeated ones.
When he finds himself in this much political difficulty, does he need a new narrative?
No administration, and especially not one that has been struggling in the polls for an extended period, gets everything its as planned.
The Prime Minister's challenges are not only because governing is hard, but because he and his colleagues have faltered, even in the recent past.
The PM expressed regret that he was sorry for saying he was "happy" to see the return of the Egyptian-British activist Alaa Abd El Fattah to the UK following an controversy when past remarks he'd made in the past – such as calls for Zionists and police to be killed – surfaced.
Starmer blamed "the system" for failing to identify what the activist had said before – a more diplomatic way of saying not my fault.
And he is facing evident political dangers as the year unfolds. His close relationship with the US president entails a new complication after Trump's intervention on Venezuela.
Based on years of interviewing 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 such action seems unlikely.
He asserted he was a "career-long champion of international law" but the public "just haven't got the full picture at the moment".
Some called for him to condemn it before we spoke. And the administration is expected to face more pressure to give an clear view in Parliament in the coming days.
There has also always been growing tension in the Labour ranks to revisit some of the outcomes of Brexit.
Sir Keir denies he's doing that, but his new specific pledge to move closer with the single market – the vast economic European market – will likely provoke accusations that he is breaking his vow never to try to reverse the choices that flowed from Brexit.
A commitment to integrate into more of the single market will satisfy a faction on his side of the party, but it is simple material for Reform and the Conservatives to
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