What does it mean to belong? Multiculturalism, integration and social division are increasingly part of the political debate. But what impact does immigration have on everyone's sense of national identity? To debate, Philip Dodd is joined by David Goodhart, director of Demos think-tank, Migration Watch Vice Chairman Alp Mehmet, Professor Jean Grugel of Sheffield University, and Sunder Katwala, director of think-tank British Future. Recorded at Radio 3's Free Thinking Festival at The Sage Gateshead on Sunday 4 November 2012.