Confectionery giant Mars has been forced to destroy millions of Twix ( Raider in Europe) chocolate bars after beetles were discovered in the flour supply of its Slough factory. Suspicion was first aroused after black specks were discovered during routine quality inspection of the Twix bars as they came off the production line. Technicians first discovered bacteria in a silo supplying flour for the production of the bars. When microbiology experts were then called in, they found beetles in the flour.