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The first Papal visit to the UK in 28 years gets under way in Edinburgh later. Professor Lewis Ayers, Bede Professor of Catholic Theology at Durham University, is in the Scottish capital for the trip's first leg, and says although the Pope many not be a natural performer, he thinks long term and wants to shape a long term debate (0h 5mins). But later, there's searing criticism from Geoffrey Robertson QC, a well known human rights lawyer and author of the recently published book The Case of The Pope: Vatican Accountability for Human Rights Abuse (3h 5mins).

The Home Secretary Theresa May is dismissing as "ridiculous" suggestions that savings cannot be made in policing, without sparking a rise in crime. Professor Alex Vitale from Brooklyn College in New York teaches criminology, and assesses it's something New York and South Korea have managed (0h 20mins).

America says Israeli and Palestinian leaders have made progress in the latest round of Middle East peace talks. Doctor Reuven Hasan, senior lecturer in the political science department of the Hebrew University of Jerusalem says if the US gets the Middle East wrong, it could push the peace process back for years (1h 10mins).

And mainstream Republicans in the US have suffered a setback in the last round of primary contests, with the victory of Tea Party candidate Christine O'Donnell in Delaware. One of the people behind her victory, Christie Shirey, tells us the people have spoken (1h 15mins).