Not sure any jobs will actually be lost or be relocated ?
LHR will continue to be a premium product even if it decision goes to LGW which now incidentally appears to be the bookies favourite (they are usually correct).
Cabinet split over Heathrow ?makes airport's expansion undeliverable? - Politics - News - London Evening Standard
If LGW gets RW2 it will simply be in a better position to handle the traffic it already has, cannot see it attracting any airlines from LHR whatsoever.