The London Stock Exchange Group offices are seen in the City of London, Britain, December 29, 2017. REUTERS/Toby Melville/File Photo Acquire Licensing RightsSummaryCompanies FTSE 100 down 0.1%, FTSE 250 off 0.2%Sept 18 (Reuters) - UK's FTSE 100 slipped at open on Monday as investors await interest rate decisions from the U.S. Federal Reserve and the Bank of England (BoE), while Britain's main manufacturing trade body cut its forecast for the sector's growth for this year. The exporter-heavy FTSE 100 (.FTSE) slipped 0.1% by 0712 GMT, while the mid-cap FTSE 250 (.FTMC) was down 0.2%. Britain's main manufacturing trade body cut its forecast for the sector's growth for this year and next, citing a sharp fall in factory output and economic uncertainty. Reporting by Siddarth S in Bengaluru; Editing by Savio D'SouzaOur Standards: The Thomson Reuters Trust Principles.

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Persons: Toby Melville, BoE, Siddarth, Savio D'Souza Organizations: London Stock Exchange Group, City of, REUTERS, U.S . Federal Reserve, Bank of England, Phoenix Group, Mondi, Sezar, Thomson Locations: City, City of London, Britain, Russia, Moscow, Bengaluru