The World Tonight

Sir Keir Starmer has told his MPs that he will not quit after the leader of his party in Scotland called on him to resign. We hear from two Labour backbenchers about the future of the party's leadership.
Also on the programme: Buckingham Palace has released a statement saying it is ready to support the police as they consider allegations against Andrew Mountbatten-Windsor.
And we travel to a field in south-west London to kick off our series about how interacting with the natural world affects our mental health.

The Winter Olympics has officially begun in Italy tonight - with, for the first time, two opening ceremonies, in Milan and in the Dolomites. One of the world's top skiers, Lindsey Vonn hopes to compete this weekend, despite badly injuring her knee ligament. We hear from another Winter Olympian why that bit of tissue is so important and speak to a British-born member of the world’s most famous bobsleigh team.
Also on the programme: A year after President Trump announced the suspension of US overseas aid, we hear about the effects on HIV treatment in South Africa
And we speak to the director of a BAFTA-nominated documentary, co-produced by Brad Pitt, looking at the influence of evangelical Christianity on far-right politics in Brazil.

Some Labour MPs have been calling for the Prime Minister to stand down, particularly in light of yesterday's extraordinary and lengthy debate in the Commons on the appointment of Peter Mandelson as US ambassador. And others have - publicly - put him on notice.  One backbencher tells us his colleagues need to learn from recent political history.
Also on the programme: The newspaper that brought to light the Watergate scandal - The Washington Post - lays off hundreds off staff.  What does it reveal about the state of the media in America? And the small scale Norwegian film with nine Oscar nominations: the director Joachim Trier tells us more about "Sentimental Value", and why European cinema is thriving.

A plan to release documents about Lord Mandelson's appointment as US ambassador is approved, after anger from Labour MPs forced the government into a climbdown. We'll ask how much danger the Prime Minister is in and speak to the head of the parliamentary committee that will determine which documents - related to the appointment - will be released.
Also on the programme: As a US-Russia nuclear treaty expires, can we expect another arms race? And humour from a Briton who suffered terrible injuries after a shark attack in the Caribbean.

The Metropolitan Police has launched a criminal investigation into Peter Mandelson over allegations of misconduct in public office. It comes after the former Labour minister and US ambassador was accused of passing market-sensitive government information to US financier and convicted sex offender Jeffrey Epstein. We hear from a Labour MP who is calling on the government to fully disclose any information it has about Mandelson.
Also on the programme: ahead of the National Cancer Strategy for England being published tomorrow, the government promises better care for children with cancer. And does it matter which wood a cricket bat is made from?