A flagship water privatisation scheme for Africa has collapsed amid claims that the British company involved has failed to improve the supply for millions of people...Tanzania has made a series of allegations against Biwater, which is working in Dar es Salaam with the German engineering firm Gauff under the name City Water...Yesterday Cliff Stone, the British chief executive of City Water, denied the accusations and said a case had been filed against the Tanzanian government for alleged breach of contract...The collapse of the contract throws into question other water privatisations planned around the world, and the British government's involvement in them.