Diageo, the UK-based spirits farm, has announced it has sold its 80.4% shareholding in beermaker Guinness Ghana Breweries plc to French wine producer Castel Group. The company said it would retain ownership of the Guinness brand and other Diageo brands, but that these would be licensed to Guinness Ghana Breweries under a new long-term agreement. Diageo will also continue to oversee the brand and marketing strategy for the Guinness brand in …