Plot: This week The Culture Show comes from Frieze Art Fair with Andrew Graham-Dixon and Alastair Sooke. Artist Ryan Gander talks to Christian Jankowski about his Frieze project - a luxury yacht, Sarfraz Manzoor meets Anahita Razmi to discuss her prize winning idea based on the rooftops of Tehran, and Mark Kermode joins Tacita Dean at the unveiling of her installation in Tate's Turbine Hall