<p>A global workforce. Billions in sales. But, unlike Tesco or BP, few have heard of it. The Cartel is Britain¿s biggest drugs organisation, a shadowy network stretching from the freezing, fog-banks of the Mersey to the glittering marinas of Marbella, from the coffee shops of Amsterdam to the trading floors of Canary Wharf. <br><br>Run by godfathers as rich as Branson but kept in line by a new generation of teenage killers. Here is the inside story.</p>