PLEASE NOTE: We are unable to offer transcripts for our programme interviews. Today is broadcast live and the running order is subject to change.
Three men have been found guilty of plotting to kill thousands of people by blowing up planes flying from London to America with home-made liquid bombs. And Britain's Supreme Court could become more powerful than the House of Lords committee it replaces next month, a leading judge has told the BBC.
The conviction of three men for plotting to blow up transatlantic airliners has shed new light on the links between British militants and Al Qaeda. Michael Clarke, director of defence think tank the Royal United Services Institute, discusses the evidence that a man from Birmingham - Rashid Rauf - may have helped to direct the plot from Pakistan.
All hospitals should employ an alcohol liaison officer to cope with the growing problem of alcohol-related injuries, a senior A&E consultant says. Dr Zul Mirza, president of the Royal Society of Medicine's emergency medicine section, discusses what difference this officer would make.
US President Barack Obama has insisted that the "public option" of a federally-run health care programme should be part of US health care reform. North America editor Mark Mardell reports on Obama's work before his major address to a joint session of Congress.
Sir George Young has replaced Alan Duncan as shadow leader of the Commons on the Conservative front bench. Political editor Nick Robinson analyses the fall out from Mr Duncan's comments that MPs were expected to live "on rations".
Britain's Supreme Court could become more powerful than the House of Lords committee it replaces next month, a leading judge has told the BBC. Joshua Rozenberg, presenter of Top Dogs: Britain's New Supreme Court on Radio 4, considers the consequences of the change to the British Constitution.
Bad weather and political instability in the main tea producing countries have caused wholesale tea prices to double in just a couple of years. Correspondent Luke Walton considers whether this perfect storm in a teacup will affect the price of tea in the UK. Bill Gorman, executive chairman of the UK Tea Council, discusses whether tea is too expensive.
People in Bristol, home of the artist Banksy, are getting the chance to vote on whether they want to keep - or remove - some of the city's iconic graffiti. Correspondent Jon Kay considers whether the council should be celebrating or condemning the work completed illegally on the streets of the city.
Demonstrations are expected as one of the world's largest arms fairs opens in London's Docklands later. Dr Dan Plesch, director of the Centre for International Studies and Diplomacy at Soas, and Sir Malcolm Rifkind, former conservative defence and foreign secretary, consider whether defence exports can be used as a foreign policy tool.
Three men have been found guilty of plotting to kill thousands of people by blowing up planes with home-made liquid bombs. Security correspondent Gordon Corera reports on the convictions. Sir Ken Macdonald, head of the Crown Prosecution Service and director of public prosecutions, and Andy Hayman, former assistant commissioner for specialist operations at Scotland Yard, discuss the biggest terror investigation in the UK.
What could be so important about a purple Perspex protractor? According to the comedy writer Arabella Weir, writing in the Guardian, it is the difference between her daughter being happy and successful at school and not. She discusses whether children's demands for school equipment should be met with the features writer - and mother of two - Viv Groskop.
Senior US and UN officials have met Afghan President Hamid Karzai to reiterate their concerns over fraud in the recent elections. Correspondent Chris Morris reports from Kabul on their concerns ahead of the latest results in the vote.
The government will have to start "cutting costs" as it deals with the effects of the recession, Chancellor Alistair Darling is expected to say. John Wraith, of RBC Capital Markets, discusses government forecasts that public borrowing in 2009 will reach £175bn.
The British Film Institute (BFI) is embarking on a three-year project focussing on Britain's industrial heritage. Lee Hall, writer of Billy Elliot, and Patrick Russell, curator of non-fiction at the BFI, discuss the history of the coal industry portrayed on film.
Alan Duncan says his sacking from the Tory front bench was a "sensible decision" after his comments on MPs expenses were secretly recorded. Times columnist Matthew Parris discusses Mr Duncan's comments that he is "very happy" to take up a new job as shadow prisons minister.
The new Darwin Centre at the Natural History Museum will house 17 million insects and three million plant specimens. Arts correspondent David Sillito previews the collection with the museum's director of science, Richard Lane.
How serious is the current terrorist threat? Ed Husain, co-founder of anti-extremism think-tank the Quilliam Foundation, and Dr John Gearson, director for the Centre for Defence Studies at King's College, London, discuss whether the prosecution of three airline bomb plotters show that British intelligence efforts are neutralising any danger.