UPDATE 2-FTSE 100 hit by economic worries, ex-dividend trades
* FTSE 100 lags S&P 500, STOXX 600 YTD* Antofagasta drags main index after H1 profit fall* Real estate stocks gain on defensive plays (Updates to close)By Muvija M and Ambar WarrickAug 20 (Reuters) - UK shares ended lower on Thursday after the U.S....
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