Refer to the input text as context and select the correct relationship between 'Babcock International' and 'London' from the available options.
Options: developer, publisher, employer, location of formation

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.
location of formation