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

Yolande Barnes, head of Savills World Research, agrees that wealthy overseas buyers looking to diversify their portfolios could give a boost to the top end of the London market.

Answer: headquarters_location