 Hold on to that chocolate bar in your pocket. It's probably going to be going for a lot more money pretty soon. I'm Vicki Barker at the Foreign Desk in London. Cocoa farmers in the world's second biggest producer, Ghana, have only managed to harvest about 55% of the average annual yield this summer, with the world's biggest cocoa grower, Ivory Coast, also seeing a disastrous season. Expect the price of your favorite chocolate bar to rise even further in the months to come.