11 Jan 2019 --- UK retailers have experienced the worst Christmas trading in a decade as sales plummeted during the last festive season before Brexit. Consumers remained cautious despite many of the retailers slashing prices in a bid to encourage spending. However, the food category did show a slight uptick. Supermarket Tesco also defied the trend by posting a trading update with like-for-like sales over Christmas rising 2.2 percent in its UK stores compared with the same period last year.