A combination of personal testimony, leaked documents and satellite imagery points to a systematic policy of repression of the Muslim Uighur population of Xinjiang province in China. Jewher Ilham, a young Uighur woman, currently living in America, tells Stephen Sackur about her campaign to save her father who has been imprisoned for the past 7 years. The fate of the Uighurs has become a geopolitical issue - but is anything going to change?