Documentary looking at how the German supermarket has succeeded in the UK, overcoming industry hostility and old-fashioned snobbery to win the public over with its discounted goods. Former staff reveal how Aldi has overcome shoppers' suspicions using a host of clever techniques to cut costs, from multiple barcodes and less time spent at the tills, to their own-brand products - which are intended to look and taste like their big-name counterparts, but cost a fraction of the price