World at One - 10/04/2009

National and international news with Shaun Ley. The Immigration Minister Phil Woolas discusses the security threat of Pakistani nationals studying in Britain on student visas. Plus, why 11 years after the Good Friday agreement, Northern Ireland's non-sectarian parties have failed to make much headway. Brian Hanrahan is in Poland, where the country is marking 20 years since the Solidarity opposition was legalised.