LONDON MARKETS: Retailer Tesco Weighs On London Shares By: FOX Business January 13, 2011 at 12:34 PM EST LONDON (MarketWatch) -- Stocks in London fell Thursday, led lower by Tesco PLC as the retailing giant issued a disappointing sales update. Read More >> Related Stocks: Lloyds Banking Group Plc ADR Rio Tinto Plc ADR Royal Bank Scotland Group Plc