Fast food firm finds some beef contains more than 10% equine DNA as Birds Eye confirms ready meals were contaminatedTaco Bell, the US-based fast food company, has withdrawn its taco beef products from sale in British and Spanish outlets after finding some beef contained more than 10% horse DNA. The move came as Birds Eye confirmed that two ready meals it removed from supermarket shelves as a precaution last week have proved to have "low levels" of horse DNA.Taco Bell has three UK outlets, in Manchester's Arndale centre, and the Lakeside shopping centre and Basildon in Essex.