I think the Coalition is right- I'd say that in general the more senior you are, the less location matters. Also, if the decision is (e.g.) where to put a factory, then no-one has to move. You can just hire locally for the plant. A few people from HQ might have to go and live in (eg) Poland for a few years to oversee the build, but they could just weekly commute. The world is getting a lot smaller and places which seemed so far flung a couple of decades ago now seem like they're just next door. This is part of the problem we have at the moment because downward pressure on wages due to inequalities in global purchasing power is intensifying as it's never been easier to relocate some of your business overseas.
On the Ford issue, when Ford closed Dagenham, they lost about 3,500 jobs. However, they'd just axed another 4,000 in Germany/Belgium (in 1999/2000) so I'm not sure we can say that the higher European redundancy costs protected those jobs. There was some transfer of Dagenham production to Cologne, but that was because the plant was newer so they could switch between models more quickly (i.e. they needed to be able to do shorter production runs of more models) and because Cologne could make a Fiesta 6hrs faster than Dagenham. Therefore it was much a decision about which plant was most suitable for their future needs than which workforce