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

When it launched with four branches in London in 2010, Metro Bank became the first new high street bank in 100 years.

Answer: headquarters_location