What has the Turner Prize ever done for us?

The Turner Prize is probably the most prestigious contemporary art prize in the world. It puts art in the headlines - though not always for the right reasons. In this programme, critic and broadcaster Waldemar Januszczak looks back over three decades of critical acclaim, public outcry and artistic controversy, hearing from the winners, nominees and judges to find out what the history of the prize can tell us about our relationship to the relevance and purpose of contemporary art.