Utilize the input text as a context reference, choose the right relationship between Wallis 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.
Text: (Additional reporting by Christopher Johnson in London and Keith Wallis in Singapore; Editing by David Evans and Dale Hudson)
user
headquarters_location
assistant