Utilize the input text as a context reference, choose the right relationship between 'Premier Oil' and 'LONDON' from the options.
Options: headquarters location, stock exchange, creator, distribution format

LONDON (ShareCast) - Premier Oil (LSE: PMO.L - news ) rallied after Jefferies upgraded the stock to 'buy' from 'hold' and raised the price target to 185p from 170p, on the basis of "continued operational delivery in 2H15".
headquarters location