Confectionery giant Cadbury Schweppes has bought organic chocolate maker Green & Black's at a time when demand for healthier products is booming.

The maker of Dairy Milk, did not disclose the sum it paid for Green & Black's, but it is estimated the company paid around £20m.

Green & Black's is made with a high cocoa content and is the fastest-growing confectionary brand, with 5.1% of the UK market for block chocolate. It claims to have made the world's first organic chocolate.

The company sources the cocoa beans for one of its chocolates under Fairtrade agreements from countries such as Madagascar and the Dominican Republic.

Green & Black's also makes organic ice creams, biscuits and cooking products which are sold on the High Street through retailers such as Boots and Tesco.

Green & Black's was set up in 1991 by Craig Sams and his wife Josephine Fairley. A group of investors led by the former chief of the New Covent Garden Soup Company, William Kendall, bought an 80% stake in the firm in 1999.

A major refinancing followed and since then sales have blossomed, with an annual growth rate of 69%, reaching £22.4m in the last year.