For a top fashion brand it's the ultimate nightmare - when all the wrong sort of people start wearing your brand. Burberry is the epitome of high fashion but now its distinctive beige tartans have become popular with so-called chavs. The worst moment - the appearance in the tabloids of an ex TV star covered from head to toe in Burberry check. And now Burberry is also having to take on counterfeiters who are ripping off their designs and making cheap copies available on marker stalls. We follow Burberry's fight back.