Analyze the relationship between 'Tullow Oil' and 'LONDON' within the context of the input sentence.
Options: publisher, headquarters location, parent organization, subsidiary

LONDON (ShareCast) - (ShareCast News) - Tullow Oil (LSE: TLW.L - news ) was under pressure after saying gas exports from the Jubilee Field to the Ghana Gas plant at Atuabo have been suspended since 3 July due to technical issues and is expected to resume mid-August.
headquarters location