What is the relationship between Premier Oil 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) - Canaccord Genuity (Other OTC: CCORF - news ) upgraded its recommendation for Premier Oil (LSE: PMO.L - news ) to 'hold' from 'sell' and lifted its price target to 105p from 100p.

Answer: headquarters_location