Keir Starmer says it is ‘staggering’ and ‘unforgivable’ that he was not told Peter Mandelson had failed security vetting before taking up the role of US ambassador. The comments follow a Guardian investigation that exclusively revealed Mandelson had initially been denied clearance after a background check by security officials, but that the decision was overruled by the Foreign Office. Lucy Hough speaks to the Guardian’s head of investigations, Paul Lewis – watch on YouTube

When it comes to theology, Donald Trump’s vice-president clearly knows best. Are we about to see an American break with Rome?

The battle to be the absolute worst Trump henchman can feel so closely fought. But in the end, it’s always JD Vance, isn’t it? You would say Stephen Miller, but Miller’s too hidden to qualify as a front-of-house henchman among the US president’s court of grotesques. Stephen’s clearly been judged so wantonly horrifying that the administration must keep him out of public view. If you enter the store, Miller is the only-for-the-initiated entity alluded to in a whisper by the oleaginous sales assistant. “We do have something in the back – off-the-books, as it were – if sir is after something a little more … specialist.”

But Vance? Vance besets us like the 11th plague – the plague of media appearances. For the next South Park season, I hope the creators give their brilliantly ghastly little vice-president avatar a papal mitre to wear. After all, here we have a man whose pick-me book on his journey to Catholicism has yet to even be published. That tome currently lies in the rectum of HarperCollins, ready to be excreted in June – yet inevitably, Vance is already giving menacing doctrinal advice to the pope as part of the multi-theatre fallout of Operation Epic Facepalm.

Marina Hyde is a Guardian columnist

Though welcomed by chefs and campaigners, many schools say the government’s plan to remove ‘grab and go’ options from the menu is a step too far

It is lunchtime at Richard Challoner school, a Catholic comprehensive for boys in New Malden, south-west London. The familiar smell of school lunch is beginning to waft around the corridors.

In the canteen, there is a moment of calm as the kitchen team make final preparations before year 7 descend – a mass of chatting, laughing boys, with backpacks swinging and empty tummies grumbling.

George Robertson has joined Reform and the Tories in making the case. Look welfare recipients in the face and say that

The benefits budget is now a magic money tree. Whenever Conservatives or Faragists make wild promises – tax cuts, more police, more punishment, more bonuses for marriage – and are asked how they would pay, the answer is always “welfare”. The sums are enormous. “Only the Conservatives will cut welfare spending by £23bn and get Britain working again,” the party insists.

More unexpected was the klaxon from the Labour peer George Robertson this week, demanding a cut in benefits to finance defence. “We cannot defend Britain with an ever-expanding welfare budget,” said the ex-Nato chief, wanting to pluck this juicy plum to fund defence. Good to see him slapped down sharply by the government: there is no “zero-sum game” between these two budgets, said the chancellor’s deputy, James Murray.

Guardian Newsroom: Can Labour come back from the brink?
On Thursday 30 April, join Gaby Hinsliff, Zoe Williams, Polly Toynbee and Rafael Behr as they discuss how much of a threat Labour faces from the Green party and Reform UK – and whether Keir Starmer can survive as leader. Book tickets here or at guardian.live

Polly Toynbee is a Guardian columnist

With prices at the vets soaring by more than 60% since 2016, tests such as MRI scans for dogs can exceed £3,500

Why does my vet charge more than a private hospital for humans? I’ve been quoted £1,500 for an MRI scan for my dog. When I looked at how much it would cost for a person to have the same type of scan privately, it was about £700.

As technology improves, the treatments and diagnostics available for pets are getting closer to what is on offer for human patients. While we used to rely on a vet to assess what was going on inside an animal, they can now recommend hi-tech scans to see exactly what’s happening. But progress costs money.

Trump administration has riled head of Catholic church over use of theology to justify conflict in Iran

The contrast in experience between the two men disagreeing over war and theology was striking.

On the one side was Pope Leo XIV, the first North American to head the Catholic church and the first cleric from the Augustinian order, who this week visited the modern Algerian city where Saint Augustine once lived. For Leo, who wrote his doctoral thesis on Augustine’s ideas, it was the culmination of a lifelong intellectual interest.

PM ‘furious’ as spokesperson insists Downing Street repeatedly sought facts of the case without being told

Keir Starmer has said it was “unforgivable” that he was not told that Peter Mandelson had failed his security vetting before taking up his role as ambassador to Washington.

The prime minister said he was “furious” about what had happened, as he insisted he had not known that security officials had recommended that Mandelson be denied clearance.

While the Labour leader is deeply unpopular, several factors – including the Iran war – seem to be delaying his exit

• UK politics live – latest updates

It still feels improbable that the UK prime minister, Keir Starmer, will face a formal challenge even if, as assumed, his Labour party performs disastrously in next month’s local elections. But for many of his MPs, the latest revelations about Peter Mandelson have emphasised that the question is simply one of when, not if.

“It does seems incredible that he didn’t know, but the problem is that it’s quite possible as well,” was the summary of one backbencher, in response to No 10’s insistence that no one had told the prime minister that his pick to be the UK ambassador to Washington had failed his security vetting.

How did the PM’s chosen US ambassador fail security vetting, what exactly did he know, and what next?

Downing Street has tried to do a lot of explaining, as has Keir Starmer himself. But there are still plenty of things we do not know about how Peter Mandelson failed security vetting, and what the prime minister did or did not know about it.

Keir Starmer says it is ‘staggering’ and ‘unforgivable’ that he was not told Peter Mandelson had failed security vetting before taking up the role of US ambassador. The comments follow a Guardian investigation that exclusively revealed Mandelson had initially been denied clearance after a background check by security officials, but that the decision was overruled by the Foreign Office. Lucy Hough speaks to the Guardian's head of investigations, Paul Lewis