What is the relationship between Azimo 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.

Headed by payment and P2P lending startups such as Azimo , Transferwise , CurrencyCloud and Funding Circle, fintech firms accounted for 40% of the venture investments in London firms, for a total of $472 million.

Answer: headquarters_location