On Start the Week Andrew Marr discusses the value and authenticity of art. In her novel The Improbability of Love, Hannah Rothschild satirises the art world from the Russian oligarchs and sheiks ready to spend excessive amounts, to the unscrupulous dealers and politicians, as she explores what a painting is really worth. The artist Grayson Perry has never been slow to laugh at the art world and question the role of the artist, and in his latest exhibition he brings Provincial Punk to Margate. Xavier Bray is a curator at the Dulwich Picture Gallery which earlier this year placed a cheap Chinese copy among its collection to see if visitors could spot the difference, and the filmmaker Patrick Mark tells the story of the iconic luxury brand from the 19th century - Fabergé. Producer: Katy Hickman.