In the second of two This World documentaries examining the stories behind the nation's favourite beverages, adventurer and broadcaster Simon Reeve looks at the production of coffee. He heads to Vietnam, which is the UK's biggest supplier, and travels to the remote central highlands where he meets some of the millions who grow, pick and pack the beans for instant coffee brands. The boom in the industry has made some people very rich, but Simon learns that the rapid success has come at a cost to both the locals and the environment