Millions of people could have to wait years for clean water as some of the world's largest companies pull out of developing countries because of growing doubts about privatisation projects...says the UN's second world water development report...The report cites Thames Water leaving Shanghai, Saur [part of Bouygues] leaving Mozambique and Zimbabwe, and Suez downsizing in Latin America and Africa...The UN report, which urges private firms to partner local authorities or governments, says the trend of privatisation is now reversing and that local and small-scale water companies are mushrooming.