Aldi's Supermarket Secrets

While Tesco and the other big supermarkets falter, Aldi goes from strength to strength. Named Supermarket of the Year, it has now overtaken Waitrose as Britain's sixth largest supermarket. But does the discounter always deliver on promises to provide amazing value, without compromising on quality and service? As more and more shoppers switch to Aldi, Dispatches goes undercover to investigate.