What is the relationship between 'Premier Oil' and 'LONDON' in the context of the input sentence.
Options: publisher, distributed by, headquarters location, developer

LONDON (ShareCast) - (ShareCast News) - Premier Oil (LSE: PMO.L - news ) and its joint venture partners Talos Energy and Sierra Oil & Gas have been awarded two blocks as part of Mexico's Round 1 shallow water licensing round.
headquarters location