High Quality Content by WIKIPEDIA articles! Marks and Spencer plc (also known as M S or YourM S; colloquially known as Marks and Sparks) is a British retailer headquartered in the City of Westminster, London, with over 700 stores in the United Kingdom and over 300 stores spread across more than 40 countries. It specialises in the selling of clothing and luxury food products. M S was founded in 1884 by Michael Marks and Thomas Spencer in Leeds.