Global food giant Nestle says it has taken a major step to end child labour on cocoa farms supplying its factories.

The firm, one of the world's largest chocolate producers, says it is going to work with the Fair Labor Association (FLA) on tackling the problem.

The FLA is set to examine Nestle's cocoa supply chains in Ivory Coast in January, the firm said in a statement.

Critics ask why it has taken Nestle so long to act if it knew children were involved in its cocoa production.

Humphrey Hawksley reports.