What is the relationship between Investec 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.

LONDON (ShareCast) - (ShareCast News) - Glencore (Xetra: A1JAGV - news ) shares tumbled on Monday on the back of a fairly downbeat assessment from Investec (LSE: INVP.L - news ) , which warned the stock holds little value for shareholders.

Answer: headquarters_location