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Mentholatum Co. Ltd. Industry / private company Lanarkshire Merck Chemicals Ltd. Industry / private company Nottingham Merck Serono Ltd. Industry / private company Mersen UK Ltd. Industry / private company Holytown Met Office Public institution / office Exeter Metrion Biosciences Limited Industry / private company Cambridge Mexican Talent Network UK Industry / private company London Michelson Diagnostics Ltd. (MDL) Industry / private company Maidstone Microsoft Industry / private company Reading Microsoft Research Lab UK Industry / private company Cambridge