heathrow airport

[piccadilly]

How many people does heathrow airport actually employ, and that includes everybody, also what London borough does it lie in or is part of it not in Greater London?

[koster]

Heathrow is not in Greater London, but in the county of Middlesex.

[bernardo]

Heathrow is not in Middlesex (because Middlesex does not exist and has not existed since 1964), but in the county of Greater London.  Specifically, it is in the London borough of Hillingdon.