Arts show with Lauren Laverne. Dustin Hoffman is seventy. He talks to Lauren about his new film 'Mr Magorium's Wonder Emporium'. Russell Brand speaks for the first time at the Oxford University Student Union- a tough gig, even for the fiercely intelligent loudmouth. KT Tunstall plays a song from her new album. Mark Kermode picks out the best Christmas movies. He talks to Ang Lee about his new film 'Lust, Caution'- a sexually explicit thriller set in 1940s Shanghai.