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

The agreement to sell Refinitiv to the London Stock Exchange Group is still expected to close by the end of 2020 or early in 2021.

Answer: headquarters_location