In the context of the input sentence, determine the relationship between 'Tullow Oil' and 'LONDON'.
Options: headquarters location, publisher, 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