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.

But with Vodafone chucking massive sums to improve its data and voice capabilities, not to mention embarking on massive acquisitions like those of multi-services providers Kabel Deutschland and Ono , the London firm's revenues performance has received a huge boot in the right direction.

Answer: headquarters_location