FTSE 100 slips as earnings disappoint

(Reuters) - London's main index inched lower on Thursday as companies, including Pearson and Whitbread, gave dismal trading updates, while sentiment was subdued as some key elements of the U.S.-China trade deal were not clear.China will boost purchases of U.S. goods and services by $200 billion (153.35 billion pounds) over two years in exchange for the rolling back of some tariffs under the deal.The Phase 1 deal, however, does not fully eliminate the tariffs, while the purchase targets, which..