I think the Airbus thing is different - it's not an EU project, it's a commercial venture. The main problem will come if Airbus can't easily move people around the factories, or if tariffs intervene. They already deal with currency fluctuations...
...or if it just becomes too much hassle to put the A380 wings on a barge. I also hear that the runway they use for the other components is barely long enough and can't be extended. I'd think these two issues would be bigger drivers for a move (and that could be a move within the UK) than most other things.
M.
Biting the hand that feeds IT
