Guardian: No-one needs to explain to the rural residents of Zambia's Western Province the value of water. They know all too well. Two in three people lack safe water to drink in the region's villages, and even fewer have access to a clean toilet. So when Village Water Zambia arrived offering to provide wells, hand pumps and sanitation facilities, the charity was warmly received. Likewise, when US bank Bank of America Merrill Lynch stepped in and gifted the charity's UK arm more than 100,000 over two years,...