Counter-terrorism police are now leading the investigation into the death of the former MP and Reform UK spokesperson Ann Widdecombe, in light of ‘new information and evidence’. A 28-year old white British man from Rotherham, South Yorkshire, was arrested on suspicion of murder on Saturday. Lucy Hough speaks to the Guardian’s head of national news, Archie Bland

Wes Streeting is expected to launch a leadership challenge against Keir Starmer as soon as Thursday. News of the health secretary’s plans came during the king’s speech, derailing what was supposed to be another chance for the prime minister to reset the political agenda. Lucy Hough speaks to head of national news Archie Bland

Keir Starmer is fighting for his political life as the Mandelson vetting scandal threatens to end his premiership. With no end to the Mandelson saga in sight, and as Labour looks set to suffer major losses at the local elections, can the prime minister survive? Lucy Hough speaks to the Guardian’s head of national news, Archie Bland

The queen of children’s edutainment is back after four very long months, with her most extraordinary, envelope-pushing and moving special yet. Cue absolute relief for parents the world over

For those whose cultural experiences are largely absorbed through the prism of their mewling infants’ demands for the same thing 437 times in a row, it’s been a long four months. In late October last year, Rachel Accurso released Brush Your Teeth Song with Ms Rachel and Elmo. The 48m views it has since racked up reflect its status as a solid addition to the Ms Rachel canon, and the whole thing is obviously enhanced by Elmo’s guest spot. But it was studded with reheated clips from previous compilations, such as The Wheels on the Bus from Blippi & Ms Rachel Learn Vehicles, and It’s Potty Time from Potty Training With Ms Rachel. There is a limit to the number of plays an adult can reasonably be expected to endure of a bear puppet in a nappy hymning his ability to relieve himself, and the Ms Rachel hive is thirsting for something new.

Enter, on Friday, Learn With Ms Rachel – Friendship & Social Skills, an hour-long compendium, in which the leviathan of contemporary children’s edutainment helps her guests “model important social skills such as kindness, taking turns, sharing, asking a friend to play and helping others”. A few minutes on any of the subreddits that pore over Ms Rachel content clarifies the weight of this cultural moment. Or you could ask my two-year-old about it.

Former US ambassador Peter Mandelson has been released on bail after his arrest over claims he committed misconduct in public office during his friendship with the convicted child sex offender Jeffrey Epstein. Police have been investigating allegations that he leaked Downing Street emails and market-sensitive information to the disgraced US financier during his time as business secretary. Mandelson has denied any wrongdoing. Lucy Hough speaks to the Guardian’s head of national news Archie Bland – watch on YouTube

Peter Mandelson faces a criminal investigation over allegations he leaked Downing Street emails and market-sensitive information to the child sex offender Jeffrey Epstein in 2009. The Metropolitan police are investigating Mandelson, who was then business secretary, on suspicion of misconduct in public office, an offence that carries a maximum sentence of life imprisonment. Police are also reviewing fresh allegations about the former prince Andrew Mountbatten-Windsor. Lucy Hough speaks to the head of national news, Archie Bland.