Gaint supermarket 'to rival Tesco and Sainsbury's' takes step into UK JD.com, China's biggest retailer by revenue, is set to open a website in the UK JD.com, China's biggest retailer by revenue, is set to open a website in the UK, (Image: Getty Images ) The UK's biggest retailers are set for major competition from China as a giant company takes a step into the UK. JD.com, China's leading retailer in terms of revenue, is reportedly gearing up to make its mark on the UK market. With a customer base exceeding 600 million, the retail giant is expected to pose...