Take context from the input text and decide on the accurate relationship between 'Balfour Beatty' and 'LONDON' from the options provided.
Options: headquarters location, industry, currency, product/material produced

LONDON (Reuters) - British infrastructure group Balfour Beatty (BALF.L) issued a fresh profit warning on Thursday, saying it had found further problems in its business which are likely to tip it into another loss for 2015.
headquarters location