With Christmas just around the corner, Channel 5’s Aldi At Christmas is a look at the history of the German retailer that arrived in the UK in 1990 and has gone from a grocery chain that once baffled its British customers to become one of the UK’s favourite supermarkets. It’s taken on the big brands with its cheeky Christmas ads and seen its mince pies, crackers and Christmas puddings often stand out in blind tests against those of Fortnum and Mason and Harrods.