The chairmen of FTSE 100 engineering giant Babcock International (LSE: BAB.L - news ) , British Land (LSE: BLND.L - news ) and the AA have put their names to an open letter from Heathrow chairman Sir Nigel Rudd urging ministers to support expansion of the west London airport.
What is the relationship between 'Babcock International' and 'London' in the context of the input sentence.
Options: brand, chairperson, distribution format, headquarters location