Safe drinking water is something we take for granted in this country - but across the world, many people are still living without basic sanitation. Take Malawi in Africa as an example. 1.7 million people - 10% of the population - don't have access to clean water. Now the South's biggest water company, Thames Water - based in Reading - is on a mission to change that. Mel Bloor explains.
Credit: Malawi footage courtesy of WaterAid