China goes to extraordinary lengths to monitor and mould the lives of its citizens. The most extreme example can be seen in Xinjiang, home to more than 10 million muslim Uighur people; but the principle of stability through authoritarian control applies across the country. Stephen Sackur speaks to Wu'er Kaixi, a Chinese political dissident in exile since the Tiananmen uprising and himself a Uighur. Has China found a way of successfully suppressing dissent?