Utilize the input text as a context reference, choose the right relationship between Inmarsat and London from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

5,855.00p +2.92% Smiths Group (Other OTC: SMGKF - news ) (SMIN) 1,129.00p +2.54% FTSE 100 - Fallers Mondi (MNDI) 1,409.00p -4.67% Inmarsat (LSE: ISAT.L - news ) (ISAT) 1,001.00p -1.96% London Stock Exchange Group (LSE) 2,425.00p -1.86% Aviva (Amsterdam: AW8.AS - news ) (AV.)

Answer: headquarters_location