How can investors tap in to Nigeria's diaspora?

According to a report by the African Development Bank, money sent home by migrants - known as remittances - is the most important source of external finance to Africa and reached $64bn (£53bn) last year.

But how can businesses and governments tap into the diaspora - a potentially vast resource - to fund projects on the continent?

The BBC's Ijeoma Ndukwe reports from London for Africa Business Report.