Utilize the input text as a context reference, choose the right relationship between Vodafone 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.

Although Vodafone has long spoilt its investors with above-average dividend yields, concerns abound that the London business will subsequently struggle to keep its progressive payout scheme on track.

Answer: headquarters_location