Kazakhstan's shiny new capital city Astana tells you plenty about the country's oil wealth and its big ambition to be Central Asia's regional powerhouse. But all of this can't mask a nagging question: what happens in this country when the long-serving president Nursultan Nazarbayev finally leaves power? HARDtalk's Stephen Sackur talks to the chairman of the Kazakh Senate and de facto number two to the president, Kassym-Jomart Tokayev. Is Kazakhstan tiring of one-party rule? Show less