(Reuters) - London's FTSE 100 slipped for a second straight day on fears that the U.S. ratification of a law backing Hong Kong protesters would dent progress made in trade talks with China, even as Ocado outshone after a partnership with Japan's Aeon.The main index moved further away from a near four-month high it hit earlier this week and gave up 0.5%, as trade-sensitive stocks such as Asia-focussed HSBC and miners weighed.Bucking the trend, Ocado jumped 11% and was on track for its best..