FTSE 100 falls behind Europe as earnings disappoint

(Reuters) - Underwhelming trading updates from Pearson and Whitbread broke a three-day winning run for London's main index on Thursday, while investors exercised caution amid a lack of clarity on some elements of the U.S.-China trade deal.The FTSE 100 drifted in and out of the red but ended 0.4% lower, underperforming the STOXX 600 which added 0.2%. All but one sector ended the day in negative territory.The FTSE 250 , however, eked out a 0.04% gain, helped by a strengthening of the pound as..