UPDATE 1-London stocks retreat as U.S.-China tensions weigh <!-- no image --> <div>* FTSE 100 down 0.8%, FTSE 250 off 0.7% (Adds analyst comment; updates prices)<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8RENNFj8Bgw:H8FJiBaVC6A:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8RENNFj8Bgw:H8FJiBaVC6A:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=8RENNFj8Bgw:H8FJiBaVC6A:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8RENNFj8Bgw:H8FJiBaVC6A:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=8RENNFj8Bgw:H8FJiBaVC6A:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/8RENNFj8Bgw" height="1" width="1" alt=""></div> Posted by Reuters