Trafalgar Square, their number is close to a hundred, and their mission is to bring clean, renewable energy into British homes. Yes, we're talking about turbines. The latest wind farm to be erected near the Queen's most sovereign isles is said to be the largest in the world (for now) and promises to produce enough energy to keep 240,000 homes going -- the equivalent of half the county of Kent. It's part of the UK's grand plan to generate at least 20 percent of all its power needs through the taming of the winds and cost the Kingdom a cool £780 million ($1.2b) to build. That's admittedly a big bill to swallow, but there are worse things to blow your billions on... such as, say, the Millennium Dome.