What is the relationship between Metro Bank and London in the context of the input sentence. Choose an answer from: 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.

Metro Bank now has more than 35 branches open, most of which are concentrated in London and the south-east, and has continued to report strong customer and deposit growth despite ongoing losses.

Answer: headquarters_location