A review of the week's television presented by Ludovic Kennedy , who discusses the Panorama programme (BBC1) on Britain's security services. I Heard it Through the Grapevine (ATV), a documentary about James Baldwin 's return to America's deep south, and the classroom series Grange Hill (BBC1) with Liz Forgan of The Guardian, writer and headmaster Bernard Ashley and New Statesman journalist Christopher Hitchens .