UK stocks of the Royal Enfield Bullet 350 Classic are down to the last 100 units and once they are sold the longest surviving production motorcycle in the world will no longer be available to British bikers. Powered by a cast iron 346cc single cylinder pushrod engine, the Bullet Classic 350 produces 18bhp and, apart from minor detail changes to the electrical system, is virtually unchanged since it first rolled off the production line 53 years ago. Although capable of delivering 108mpg, making it an eco-friendly vehicle in terms of fuel consumption, tough new European emissions regulations have proved too stringent for the 1950’s technology of the engine, which will be replaced by a clean new fuel-injected 500cc alloy unit for 2009.