A worker loosens the tea leaves on their arrival at the Kitabi tea factory. The green leaves are spread out in huge trays for the process of withering. Warm air is blown through them until they loose approximately 65% of their moisture. As Rwanda's biggest export earner tea is a very important part of the country's development process. Gisovu, Mata and Kitabi, the three mountainous tea estates which border the Nyungwe Forest in south western Rwanda, consistently command the top three prices of any African-grown teas, and supply the tea that is exported to Britain and blended to produce Yorkshire Tea.