BBC taken on China 'corruption tour' in Henan province

When Chinese President Xi Jinping started a massive anti-corruption drive across China two years ago, he vowed to track down corrupt officials at all levels of the Communist Party.

The BBC's Celia Hatton travelled to Guangshan in Henan province, in central China, to meet a man who has seen both sides of the battle against corruption - first, as a government official, and then as a whistle-blower.