Zambia prepares to mark fifty years of independence

Zambians are celebrating 50 years of independence this year. A country once beset by problems like hyper inflation, Zambia's economic fortunes are now on the up. But poverty is still widespread. And as mystery continues to surround the health of President Michael Sata, there are concerns about the transparency of governance. The BBC's Nomsa Maseko spoke to Zambia's former president, Rupiah Banda.