Let's take Rolls Royce. It was on the radio this week that the team who get approval for engine designs is leaving GB for the EU because only teams based in the EU can approve engines for flying. Ironically, the Telegraph discussed plans to do this by referring to the iconic British brand, but guess who owns Rolls Royce? BMW. ANd before that Volkswagon owned it.

Oh, well if it was on the radio it must be true.
Do you honestly think that American businesses (or any other major manufacturing nation) have to get their engines approved in the EU?
It would seem you're only reporting part of the story, or misconstruing it.